Toxic coworkers

So I’ll keep it short but I have a co worker and we were great friends for a while and out of no where she changed (right around the time I told her I am TTC- she has a 3 year old btw) and now she bullies me. I don’t know what to do. I literally took a personal day just because I needed a break from her. I’m also concerned because I’m trying to stay stress free as I’m TTC and this is causing a ton of stress. Sorry if not appropriate for this group, idk where to post)