What is my next step if she has served me with quit title?

I am not totally sure what you are asking. There are a couple of scenarios that would fit. When you say "quit title" do you mean "quiet title", Notice to Quit, or "Quit Claim deed" ? If quiet title, that is a court proceeding gain full title to a parcel of real estate where the court determines who own the property. If Notice to Quit that is an eviction notice. If Quit Claim Deed, that is where the conveyor of title transfers all their interest in a parcel of real estate to another person. A QCD is not a warranty deed and it can be used to transfer fictitious interest in the property. For example, I can give you a QCD to the Statue of Liberty transferring all of my interest in the statue. I have no ownership interest but I can still give you a QCD. If you received a QCD from your sister (and I assume that's what you mean by "fast claim deeded", you need to make sure she actually has an ownership interest in the property. Your county Register of Deeds can help you determine that. If you actually have a QCD from her, then you will go to the Register of Deeds and ask them to record it. There will be a fee charged.

Now is the time to get this straightened out, see an attorney and make sure it is titled in your name at the registrar of deeds.