Redemption Laws (Pennsylvania)

[Ayodeji Kuponiyi]

I'm currently working with a seller (wholesaling my contract for her house)  and she informed that her mother's house was just bought by an investor. Her mother has dementia and her house was recently sold at an auction due to 2 years back payment for taxes. The seller told me that she never received the notice (she pays the taxes on her mother's house and currently rents it). I know NY & NJ has redemption laws for owners to buy back their property within 30 days. What can this seller do? She just found out her mother's house was sold when the tenant called and told her that an investor told them that the bought the house at an auction. What can she do?