If the deed to the property lists you as the only owner then you may sell the property and pay off any existing liens.
If this answer was helpful, please mark it as helpful or as a best answer. This answer is for general education purposes only. It neither creates an attorney-client relationship nor provides legal guidance or advice. The answer is based on the limited information provided and the answer might be different had additional information been provided. You should consult an attorney.
You don't mention why "she" think she has some kind of rights to the property...is there some kind of arrangement or agreement between you; if she loaned you money there is I assume some terms that would govern; even though title is in your name, if there is a contract between the two of you with terms that give her some purported rights to the property, "she" can have a legal action against you and if, the contracts requires, yes "force" you to put title "back" into her name. (Well actually the court order would force you not her)...there was obviously some agreement where title cam out of her name; your questions doesn't give all the facts.
The foregoing is for informational purposes only and may not be relied on as attorney-client advice.