I'm so sorry you've got all this stress - and poor Biscuit

There was a forum piggy called Little who had no bottom incisors at all and had to re-learn how to get food into his mouth but he did it - they can do it and even in such extreme circumstances can relearn how to eat independently. Sometimes you have to offer little slices of veg or slivers of leaf at first to encourage them to build a bit of confidence..? All they know is that they
could eat, but they can't now - they don't necessarily know that they will be able to eat again and hopefully quite soon. Syringing will help her not feel hungry while she sorts herself out. If there has been physical damage to the teeth get back in touch with the vet and let them know - even if you choose to go to a different vet in the future. They will want to know.
My rainbow girl Ivy had her incisors burred once - but rather too short - and she had to figure out how to get food in and keep it in. Saying that, Ivy actually found the chewing part easier as her overgrown incisors had been in the way. Her chewing speed improved no end. The vet that spotted the incisors said she couldn't close her mouth properly. The senior vet who actually did her teeth was experienced with the burr tool but hadn't realised she had caught the lip - neither did I until the next day when Ivy clearly had a fat bottom lip and was extremely irritated with me! I phoned in to let them know and got advice on pain relief and what to watch out for regarding complications. Luckily there weren't any and it took about a week for the bottom teeth to meet the top ones again.
It's not been a great experience for either of you (or the vet by the sounds of it) and I really hope this doesn't set Biscuit back too much. If you have anything wooden like a bendy bridge, or a thick brown cardboard box, she might feel like she wants to bite at something to re-shape those front teeth. It's perhaps why she went for that plant pot.
PS: On a previous occasion I did tempt Ivy to eat with dry Fruit and Fibre flakes which were obvs not part of her regular diet but perked her up a bit when she was down. I don't know why she liked them - the others were never bothered! I think she quite liked the crunching.