We are only feeding her the flakes for less than a week so we are sure her gut is okay.
They have hay in the cage and yesterday I saw her eating some which relieved me.
I forgot to weigh her today, I overslept a little and I only had time to feed her and give her the meds. Tomorrow I'll weigh her! She seems heavier than when we brought her to the vet so it's a good sign! She's also much more active than before!
Thank you for that feedback, which sounds very positive. It is important that she is able to eat the tough hay fibre for her long term health but it can be rather difficult for guinea pigs to get back to doing that after dental treatment and any resulting gut problems. That is why it is important for me to check that all is really going in the right direction; which is great news.