That is a rather rotten thing for your "friend" to do. The original quitclaim deed is not valid unless it is delivered to you, although since it was recorded it indicates to everyone else in the world that you are the owner of hte condo. Unless something happened, this shouldn't make you liable for anything so long as the HOA fees were fuly paid, but it is uncomfortable to be unknowingly drawn into the situation, particularly if she is engaged in defrauding her ex or her creditors.
Signing a quitclaim deed will remove the property from your name, but you might alway want her to sign something stating that you never received or accepted the prior deed and agreeing to indemnify you for any claims related to the property. My biggest concern is that her ex would learn that she was hiding the property by shifting it into your name and he might seek to bring some sort of claim against you.
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You need to consult with an attorney for sure. I am concerned about what has occurred while you "owned" the unit as a result of the quitclaim deed not from a liability perspective but from a getting dragged into court perspective. If you had no knowledge that the unit was quitclaimed to you, you have numerous viable defenses against any liability. Your "friend" needs to get a lawyer and your lawyer needs to make immediate demands to insulate you from any and all liability related to the condo.