moh no longer wants to give a speech- 10 days before the wedding

Just venting here. My MOH is a friend I’ve known since childhood. I also have 3 sisters, who are BMs. I thought about having one of my sisters as MOH but had a hard time choosing between them so I asked this close friend instead, and I am happy to have her! I asked her months ago if she would be willing to say a few words at the reception, and she agreed. I made it clear at the time that if she wasn’t comfortable doing so, that that would be fine and I would ask my sisters instead. But since she is MOH, it is custom (at least in my experience) for her to say a speech and so I wanted to ask her first. We have a long lasting friendship and many memories that can be mentioned.
Now it is 10 days before the wedding and she tells me that she is super nervous to give a speech due to anxiety public speaking and asked if I would rather someone else speak instead. I am trying to be understanding and I of course don’t want to force anyone into saying anything, but I am annoyed at the timing of this. I wish she had told me earlier and we could have figured something out. My fiancé has both his best man as well as his brother saying a speech. I have now asked my sisters to say one but I feel bad that is so last minute. What is the best way to handle this situation?