Deceased Sister's Ipad

Hi, My sister has recently passed away and had an Ipad (model A2270) 8th generation. It is still under Warranty (expires 5/10/22).

We know the lock code and are able to open it, and we've cleaned any important information and pictures off the iPad, but we don't know her Apple ID password. We know the email address on the account, but don't know the password for her email and therefore can't reset the password. Without access to her Apple ID we can't switch the device to a new Apple ID, which renders it not very useful.

I hate to throw it away, but it is not very useful with her old Apple ID in it. Question is, is there any way to reset it and put it under someone else's Apple ID without knowing her current Apple ID password?

We don't have the original receipt for when it was purchase, but we do have a death certificate for her.

If there is no way to assign it to a new Apple ID, can it be used for a trade in to get a discount off a new device? If so, do you know how much trade credit it is worth?

Thank you

MikeN-