I don't know what your other issues are, but to me, this should not be the last straw. When you meet with the director today, I would ask her/him what precautions are NOW in place since this incident to make sure this never happens again. You definitely have the right to be concerned, but I doubt the food allergy training will be that much better at a different daycare unless you step in.
Get an action plan for them to follow if she has another reaction to anything. You will need to get this from a doctor, and have them write down everything to do from a reaction such as a rash, to a full-blown anaphylactic response. You will need to provide the daycare with all medications, and make sure they are all listed on the action plan. You will also need to make sure they are kept current, replaced when needed, and get a new plan each year.
You cannot expect your daughter to go through life without being mistakenly exposed to potential allergens, so you need to be ready for the worst case. PLAN that it WILL happen; HOPE that it DOESN'T!
Also, ask the director how she plans to train staff, and even offer to help. Make sure there is a plan in place for new hires, and subs if your daycare uses them. If you see a new face, make sure you mention your daughter's allergies. Make sure they all know how to use an Epipen, and what to do afterwards if need be.
Now that there has already been an incident, this might be the safest place for her, as they will be even more aware of her allergies. These are just people, and pineapple is not a common trigger food, so you cannot expect that honest mistakes will not be made. Plan accordingly to keep your daughter safe.
If the director cannot help you to feel like this situation is resolved, then get her out of there. Good luck!