I'm sorry to hear this. I hope she starts feeling better soon.
When my Ziggy went to the groomers for a kennel cut, they always check the animals anal glands. She did have a sight discharge. She used to drag her bottom on my carpet a lot usually to help clean her bottom but it may have also been because it felt bad. Now I've noticed that she seems so much happier and she's much more loving towards me. She now tries to sleep by my pillow at night and she never used to do this before.