An escrow is an escrow manufactured home or site built. She must conform to the escrow instructions.
I'm assuming you want to take possession of the home and live in it not lease it back. Especially to her. If that is indeed the case the last thing in the world you would want to do is paint yourself into a corner by leasing it to her. If she doesn't conform to the terms of the escrow she's in breach and you can take action against her accordingly.
You have a contract that everyone has signed so you should be able to "negotiate" the sellers requests.
Have you considered a "lease back" for the time the seller nedds needs to move? We do this often when sellers need a week or two after escrow closes. She will pay you as she would a landlord to remain in the property.
It's all about negotiations in this business and it benefits everyone to work out these "details" to everyone's satisfaction.
Don't negate the sale if you have your contract and love the property. Im sure you can work out something with the seller .
All my best,
And if you have a Contract and an Escrow, she cannot FORCE you to close early, and she cannot FORCE you to stay on the property:
You have a Contract!
If the Contract does not provide for her to stay after the Close, then she can't', as simple as that.
I'm the first to promote a Christian attitude, but it sounds like she is going too far.
You can certainly give her a NOTICE TO PERFORM and you should be ready with an Eviction Company and their paperwork; the handwriting is on the wall.
Good luck and may God bless