You should contact a lawyer who handles will contests. It may well be that there is a claim here to set aside the will on the grounds of undue influence or lack of capacity.
Here is a link that will give you some additional information:
Disclaimer: Please note that this answer does not constitute legal advice, and should not be relied on, since each state has different laws, each situation is fact specific, and it is impossible to evaluate a legal problem without a comprehensive legal consultation and review of all the facts and documents at issue. This answer does not constitute an attorney-client relationship.
RCW 11.24.010 gives you the right to contest a Will within four months of its admission to probate. Here, think "lack of testamentary capacity" and "undue influence" as reasons for invalidating the Will.
RCW 11.44.015 gives your mother the right to request a copy of the Inventory for the estate after three months after the appointment of its Personal Representative & to receive a copy of it within ten days thereafter.
Lastly, you can't "press charges" as that implies criminal action, which can only be filed by the Prosecutor's office. Here, the matter is a probate estate --- a civil matter --- so you or your mother would need to complain to the Court in probate about any wrongdoing involving your uncle.
Please ask if questions remain or if I could assist you or your mother further, as all I do is probate & around 75% of which involves probate messes, problems, & disputes (including lots of Will contests & PR removals),
Richard Wills, WSBA 19720