In my opinion, the "force feeding" could be your problem. Just leave her alone for a while and then see if she will take the bottle. Fighting with her isn't accomplishing anything.
Some tricks to getting her to take the bottle.
1 try stimulating her to urinate while she has the bottle in her mouth. Some fawns need this to cause a sucking reaction. Just take a warm damp cloth and gently wipe her butt. Don't rub harshly, that can cause a raw area.
2. Try covering her eyes with a rag or washcloth. Sometime not seeing lets them suck better.
3. Try cupping your hand around the bottom of the fawns mouth and muzzle while you put the bottle in her mouth, this can simulate the mothers groin area and can creat a sucking reflex.
4. If you have long hair, put the bottle up around your neck area and try to get the fawn to go under your hair and find the bottle.
5. Try putting a dab of kero syrup on your finger or the nipple to see if she starts sucking. Don't give too much kero because that can cause the runs.
try any of these tricks alone or with each other to see if she starts sucking on her own.