Here are the basic questions to ask:
Is this an offer to buy her rights or is this an operator trying to pay her royalties that are due? Many buyers have found back royalties and want to buy them (for a discounted value). If she has real royalties, then she probably would want to get that straightened out first.
Find out the exact description of the acreage. ask the offering company.
Ask the offering company how they got her name and what title research that did to get to that point. Ask them for a copy of the paragraph that details it.
Once she has the basic info on where it is and what they want, then she can search on the PA treasurer’s unclaimed funds site and see if there is anything there under her mother or father’s or grandparent’s or other relatives names. Have her ask her family if they are getting offers.
She can also go onto the PA oil and gas commission site and find out if there are wells on the acreage. You may have to help her with that.
Do not let her sign anything until she knows exactly what she has and what is going on. If the ask is for a sale, slow down a lot and find out why they want her acreage. If they are trying to get a Division Order to her, then they are trying to pay her royalties and that is a good thing.