Call the dmv, tell them your interested bying the car and find out what and how much the lein is for. It might not be worth the hastle !!! Through experience , if she doesn't have the title you would need to send paperwork from the dmv to the previous owner "overnighted with delivery conformation" and have them fill out the paperwork and return it to you. The reason you need delivery conformation is to proove to the DMV you sent the paperwork.If they dont send the paperwork back within a reasonable amount of time the DMV will decide if they will allow you to put the car in your name...not guaranteed they will !!! The whole process is screwed and anoying !!!
No key, no title, no paperwork, lein......
Its up to you to decide if you want the burden or not. Personally I would never do that again !!! Good luck !!!