Your call.
Sounds like she wants your help selling the game.
Dealers and brokers do it all the time, including games they sold to owners nearly 30 years ago.
If you want the bother with the time and trouble, it's your money and effort.
Collectors generally don't, due to overhead and wasted time with negotiations for resale.

Make sure she understand this method of training before you proceed.
If she cannot, it may be time to let go.

first_flowchart (resized).png

This is professionally called:
"As-Is, no warranties implied, no refunds".
Anything else is trouble unless you are a dealer. Signatures seal the deal even for court, you just need to let the buyer fully go through the game.

Sellers are happily surprised when I state these terms on the private sales invoice along with "cash and carry". It makes life simple for both sides. It also shows you are trying to be respectful.