I suspect that it may be a combo of Bonnie’s lower hay appetite and perhaps her teeth are not as aligned as they should be, so they all do not grind at the same rate. This is common with dwarf breeds because they have a squished face, so this can result in their teeth being misaligned, which is not good for getting them to all grind down! I’m unsure how to visualize “angled inside her mouth”, but if you see visually they’re different than Clyde’s, who has no dental issues, it could be a misalignment. My Wick’s bottom jaw doesn’t match up with his top (bottom incisors do not match up to top, and there’s an underbite, so the bottom go over the top teeth). He goes once a month to get his done, but recently that’s changed (see below).
I am envious that your teeth filing is only £60! Wick’s are over double that, ugh.
The best thing you can do is find ways to encourage chewing. If she is a wood chewer, find some toys to keep her occupied. I recently found with Wick that having more hay locations drastically increased his hay consumption. He used to only have 4 (a pile in each litter box), but now he has 8 locations (4 in his hutch where he sleeps), and he eats a lot more hay now. I suspect that him having multiple stations to visit is more engaging and he gets excited by that “foraging” aspect. It also helps because he sleeps where many hay stations are, so when he wakes up, or if he gets startled awake, he’s surrounded by hay to eat until he wants to fall asleep again. Wick used to get dentistry done once a month, but this past interval was 2-3 months, and the only change was the doubling of hay stations. I also noticed his poop stayed larger more consistently, so it definitely goes to hay consumption.
The answers provided in this discussion are for general guideline purposes only. The information is not intended to diagnose or treat your pet. Seek the advice of your veterinarian or a qualified behaviorist.