There should be very little coming from the Buyer's Lender for the Seller to sign unless it is an FHA.
As the seller/trustee, you probably have internal title docs like: AOF, Resolution by the Trust, etc that the Seller needs to sign along with the Deed, Tax Transfers, etc.
So, send her those docs for review - you can mark "Draft" or Copy on them and release the final "Originals" once she has reviewed them, you have reviewed her closing instructions and all parties are in agreement to proceed.
It is hard for anyone to make a rational informed decision without having all information at hand. Once you provide her, her docs and she sends her instructions, both parties know the score and proceed or as title you can call for additional requirements to be met by Seller.
Personally, I don't really see what is so complicated about the request.
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