Teeth help?

So my 1.5 year old just got a tooth (she already has quite a few) but it’s not like the rest ,it’s soft,wiggles, almost paper thin and her gum looks red and swollen, I have a dentist appointment already set for her Monday morning. Has any other moms dealt with a tooth like this? ( I would post a picture but she won’t let me get a clear enough one) also she hasn’t really been eating unless it’s something frozen like a slushy any ideas on foods to give till we see the dentist