I am a jerkface. I fell asleep (pregnant!) last night...sorry.
Here is a very good link that might help (I know your baby doesn't have a g-tube but the info should still apply) Weaning from Tubes
I would also check out this website: Oley Foundation
And this one: Popsicle Center
Information about oral aversion
This is a MUST READ
It really sounds like you are dealing with oral aversion, which is extremely hard to work out sometimes. Basically every thing around her mouth needs to be positive. I know it can be frustrating at times, but forcing (not saying you are though) or pushing will not help this get better.
Some positive play suggestions (I used these to avoid oral aversion with my son):
Kiss her mouth, blow raspberries, blow on her...whatever she likes around her mouth/face.
I would suggest letting her play with her food, finger painting with purees is a great way to let her make a mess and hopefully get some in her mouth too.
Try using different textures of things around her mouth, like silk, satin, whatever...and doing tons of mouthing play if she will let you, if not just let her explore on her own.
Does she use a paci? If so try dipping it in different purees to help her learn that food is ok, and explore different tastes. You can really dip it in anything safe for her to try.
Also vibrating teething toys are AWESOME, I highly suggest getting one. Babies love the vibrations on their mouths, and this is a positive exp you want to create.
You might be wondering what this has to do with feeding, but so far she has likely had negative experiences around her mouth (tubes..that sort of thing) and these things create positive experiences which will over all help with feeding. It will not happen over night but you can get there. Everything regarding feeding (frustratingly) needs to be slow, the harder oral aversion babies are pushed the more they get defensive.
Have you talked to your doctor? Because it sounds like you really could use the help of a speech therapist (they also deal with oral aversion), who could help you work this issue out.
Also does she have reflux? It might something worth getting checked out, even if there are no outward signs of reflux, that does not mean it is not there. Silent reflux is very common (my son has it) and it's just as bad for babies. This is another common reason babies refuse to drink/eat orally because they learn it cause pain from reflux.