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I am very sorry to hear about this situation. What she did was illegal because she tampered with someone else's receipt of mail. Under 18 U.S. Code § 1708:
Whoever steals, takes, or abstracts, or by fraud or deception obtains, or attempts so to obtain, from or out of any mail, post office, or station thereof, letter box, mail receptacle, or any mail route or other authorized depository for mail matter, or from a letter or mail carrier, any letter, postal card, package, bag, or mail, or abstracts or removes from any such letter, package, bag, or mail, any article or thing contained therein, or secretes, embezzles, or destroys any such letter, postal card, package, bag, or mail, or any article or thing contained therein; or
Whoever steals, takes, or abstracts, or by fraud or deception obtains any letter, postal card, package, bag, or mail, or any article or thing contained therein which has been left for collection upon or adjacent to a collection box or other authorized depository of mail matter; or
Whoever buys, receives, or conceals, or unlawfully has in his possession, any letter, postal card, package, bag, or mail, or any article or thing contained therein, which has been so stolen, taken, embezzled, or abstracted, as herein described, knowing the same to have been stolen, taken, embezzled, or abstracted—
Shall be fined under this title or imprisoned not more than five years, or both.
However, the problem is that under 18 US Section 3282, the statute of limitations for most federal crimes is five years. If this happened 15 years ago, the statute of limitations has already run.
Now, one may still be able to file a suit for the false bank account matter. If you tell me when she did this, I can see if this is still within the scope of being prosecuted.
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