i think if it were me i would take her off the infacol, this could be making things worse. give her a little tummy massage this may help disperse any trapped air
i wonder if she wants to eat but cant ,will she readily eat a small handful of grass if offered to her? (not too much as may cause bloat or diarrhea if she's not used to it)
when you go to the vets i would ask them to check Betty's front & back teeth for any problems (misaligned, damage, spurs, cracks, sharp or jagged edges, etc) that may be making it uncomfortable for her to eat if she wants to.
Also get him to look at her throat to check for oral thrush ( possibility if she also has a damp dishcloth smell to her breath) this could make it uncomfortable to eat much too.
i hope the frusimide tablets are starting to work? i had trouble to start off with when my Ellie was on them, got it all over the place in the beginning (used the dissolve in water & syringe feed method) but it was still easier than the Nelio i used for her heart meds... now that DID need a knack to getting it in with her.
is Betty sounding less chesty now?
healing vibes.
xx