My moh stepped down

So from the get go I had this gut feeling my MOH might say no. It seemed like she was avoiding me when we first got engaged. We live 1000 miles apart but talk just about every day, she knows me better than anyone. But about a week after I sent a package asking her to be a MOH she called and was super excited so I thought oh good it was in my head.
know she’s suffered from some anxiety and depression and has been struggling this year with a close death in her family. I’ve been calling her for the past couple weeks and no answer. Tbh I have been kind of busy and the first week I thought oh she’s working she’ll call me back. The second week I was like huh. This week I’m like something is wrong, I looked back at texts and realized in the group texts where we’re planning on the girls ordering their dresses she actually never said anything. I really got concerned I looked on Facebook which she never posts is just a lurker- she’s not in my friends list. I texted her and her sister to see if she was ok. She answered she’s not really ok she’s having issues she got rid of all of Facebook not just me, and is getting help and is going to have to take care of herself for now. I told her I was glad she was getting help and if she needs anything I’m here.
I thought about her all night and today I messaged her that I hope I wasn’t causing her further anxiety and that if being MOH is stressing her I would understand if she didn’t want to be in it. She immediately answered that she didn’t know how to tell me and that weddings in general stress her out. So she is not going to be involved. I also asked if it is just being in it or the whole thing. She said the whole thing so not only will she not be in it- she’s not coming.
I am so sad right now. Sad that my best friend other than FH, won’t be with me, but even more so that I’ve caused her such anxiety and she couldn’t tell me. I’m really glad we got to the bottom of it and can go back to things the way they were without her being worried. I’m sad I didn’t know.
Sorry I wrote a book. Thanks for reading if you made it this far.