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From a purely legal perspective, if the trustee of the trust or executor of her estate asked you to perform these duties, then you would be entitled to compensation from the trust or estate. But if you essentially volunteered to do this without any direction from the trustee or executor, then it would be up to them whether to essentially "purchase" this work product from you.
As for what is reasonable, that would have to be determined by the trustee and you regarding what it is worth for your hourly time in compiling this information and organizing it. But general administrative duties like this would tend to run in the $20-25 per hour if you paid someone to do it professionally.
However, I would opine that you could charge whoever wanted a copy of your work product whatever you felt was reasonable..