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[Star Wars] Couldn’t Padme buy Shmi from Watto?

Padme is presumably wealthy as a queen turned senator, or at least wealthy enough to buy a slave. Couldn’t she sneak off to Watto and try and buy Shmi off of him in order to free her? She was clearly shocked by the fact that her and Anakin were slaves, and knew how upsetting it was for Anakin to leave her still a slave. And she could simply pass it off as a standard humanitarian effort if she ever gets confronted about it.
gpt
In Queens Shadow she sends her maidens Sabe and some others to free Shmi from Watto but they couldnt find Watto, they freed some slaves but couldnt find Shmi and watto IIRC.

In AOTC novelisation its implied she met Clieg Lars soon after Anakin left which could be why they couldn't find her.

As for in TPM - time was running out to save her planet and they didn't have any suitable money on them.