1. Well, without seeing the papers it is difficult to make comment on it.
2. In online search you can find such old documents.
3. However you can apply for certified copy of the same for which you need help of a lawyer.
4.If this lady has validly purchased the property from your erstwhile landlord then you can purchase from her but I make no comment on her title deed without seeing the papers.
Fell free to contact if you need assistance on this.