What should I do, I am SO lost?

My friend never told me she was with anyone but randomly then told me she got engaged and the wedding was in 5 months.

Since then she's dodging my calls and when I ask for details on the guy she won't give me any and tells me she will let me know when she can meet up. She still even hasn't sent me a picture of her getting engaged. I literally only know the guys first name. That's it. Not even how they met really.

Then anytime we schedule to meet up she backs out saying she can't anymore or will tell me most likely she can meet but then says actually she can't anymore.

I am a bridesmaid for the wedding which is in one month and I have the week blocked off but I do not have a wedding invite not physical or digital.

The last week especially I've been trying to get her on the phone. She called me back once but I missed it. I've been trying to connect with her all week and she says she'll call or she's busy etc. but we never end up talking.

The only way she interacts with me is on Snapchat by sending me pics of her day and will respond to other things I message her but doesn't answer any questions about the guy, doesn't want to get on the phone and doesn't meet up.

I find this to be very odd and I feel like something is wrong with me and I don't know what to do. Why am I in this situation. I am so irritated and feel bad about myself. I don't want to just get used for being a bridesmaid and then have her ghost me.

Help?
What should I do, I am SO lost?
Post Opinion