i think my sister is in competition with me & i get weird vibes from her

Sorry this is long:

So me & my half sister got married a few months from eachother, she is a few years younger than me and I don’t know if it’s just me, but I feel like everything is a competition with her when it comes to me. She is a more loud, extroverted, center of attention type person. Whereas I’m more introverted, reserved and laid back.
So at the time I announced to my family I’m going to be getting married, my family were so excited. The first thing she said is she needs to find someone and get married! (She had never been in a relationship before) Which is fine, everyone deserves to find love. But also it was the intention behind it. A few months later she ended up meeting and marrying her husband. (Who is significantly older than her. So he was ready to settle down)
She also really wanted her wedding to be before mine (even though she had just met her bf) and it got to a point where I stopped telling her the date we were planning. I eventually just told my dad who told her and she called me saying “your wedding is going to be on THIS DATE???!!” honestly I could just hear the unhappiness in her voice when she realised it would be before hers. But I ignored it.
Anyway so when I was planning my wedding, obviously it’s a stressful time. Sending out messages to my bridesmaids everyone would reply (except for her) and I had to call her out on it. Like okay you’re ignoring my messages and it’s kinda annoying when I’m trying to plan this occasion.
She made efforts to communicate abit better after I told her. But generally as a sister I feel like she didn’t do much to contribute or help with my wedding. It was honestly like she turned up as a guest & left. Other family members and cousins etc were waaay more supportive than her, because I was planning a destination wedding and it was very stressful.
Anyway fast forward a few months later is her wedding. Me being a giving and caring person was fully emerged in her wedding prep, I did a lot for the prep and treated it like I would treat my own wedding or a wedding of a close friend. She happened to be very communicative and always very responsive if we were discussing something wedding related. She’d ask a lot of advise since I had done mine.
A few months later now she’s pregnant and I know pregnancy can bring out a lot of hormones but honestly I’ve noticed she’s the type of person that uses everything as an excuse “oh I’mToo busy for this I’m married now or oh I’m pregnant now”
She messaged me recently to find out if I’m going to be around on a certain date (and I knew it was related to her gender reveal) and I asked her if she’s still planning her gender reveal. She ignored my message then posted an info message about the gender reveal to our family group chat.
I also sent her a list of baby items to add to her registry. She completely ignored my message even though I know she saw it.
To be honest I just feel as people we make time for what we want to make time for. Because I know for sure she doesn’t behave like this with her close friends. Because she wouldn’t be able to maintain friendships
I know not everyone is on their phones all the time and She makes out that shes one of those people. But she will only contact when she needs something or not reply to my messages but still watch every single story I post online to see what I’m doing and I honestly find it very strange. Over the past few months the feeling I have gotten is that she always wants to know the ins and outs my life, what me and my husband are planning so she can be one step ahead!!!
So I’ve started moving in silence now.
My husband isn’t happy because he feels like she’s a crap sister and I put in more than she does, and I agree and see where he’s coming from. And honestly I’m tired myself.
And I do feel like this season of settling down has really brought out her true colors and I have seen a different side to her. I’m not the kind of person to compete with people. I live at my own pace. So to me it feels really strange
Am I being overdramatic?? Or what would you do in this situation?