Either the warranty deed or the quit claim will suffice as long as they are done now, while she is still alive (i.e. filed before she passes away). Since a quitclaim would be sufficient for her to transfer her interest in or share of the house to you and does not involve her making any promises or guarantees about title (all she does is transfer *whatever* she has; she does not need to otherwise do a  title search, verify that there are no liens, etc.) that is most likely the easiest thing for her to do.