First things first...
painkiller.
If your piggy liked the CC but is trying to refuse it after the procedure it could be that her mouth is very sore. My pig had her molars ground down and I got a week of painkiller for her from the vet. We had the 'dog' metacam (loxicom is another name, dog is 1.5mg/ml - it is stronger than the cat one which is only 0.5 mg/ml) and we used 0.24ml twice a day for a 1 kilo pig... but they can actually have higher doses than this without any problem. Sometimes vets only prescribe the cat version which is licensed for piggies but they have a fast metabolism so once a day wears off fast and if they don't get enough painkiller her mouth will still be too sore. If you haven't been given enough she won't want anything touching her sore mouth as food becomes pain, syringing is pain etc.
If syringing is difficult things become stressful and piggy picks up on this and can panic. There are tips in the forum guides:
Not Eating, Weight Loss And The Importance Of Syringe Feeding Fibre
Complete Syringe Feeding Guide
If you are tense she will be too so try and relax - your pig actually feels hungry which is good... some pigs don't and that makes things very hard. Try the 'piggy burrito' method of swaddling her in a towel? Only give a very little mush at a time - less than 1ml, even 0.5 or 0.2 ml at a time. I was clumsy in my first attempts and overfilled my pig's mouth making her panic about the syringe after that. if they are struggling to eat they might accidentally inhale a bit too - and we want to avoid that (which is why we don't syringe liquid like water - we just make the mush more runny). Talk gently to her, and give yourself plenty of time. You might lose several hours each day to this stage but she will not feel so hungry after. Make a cup of tea (or whatever is your choice!), sit on the floor and commit to a session - then you won't feel like you are rushing. If she realises you can go at her pace she will hopefully be less scared. Dentals are traumatic for an animal that is essentially a munching machine!
Don't fret too much yet about a 'bad dental' - just realise this stage can be painful for piggy and they lose confidence in eating, but if we can keep that gut moving and keep her interested in food there is a much better chance. Were you given antibiotics at all?
The final thing is that sometimes there is a reason for teeth overgrowth that is underlying... it might simply be spurs which have grown out of the teeth, poking into the soft tissue and making her chew on one side which means the teeth then start to be worn down unevenly. But there might also be underlying issues like an abscess at the root, causing pain when chewing on that side. Did the vet mention anything like this? This is why I was asking about antibiotics.
I have a little experience but am not an expert. We are just waking up here in the UK and you should receive more answers soon. Be brave, little Dianna