You can't assume that because other TKs can do something that Psylocke can. Pretty much everyone can pick up a dime...except Psylocke. And regardless of whether Psylocke packs more punch than Rachel, she's not as accomplished as Rachel with that punch. And while the Uncanny scan shows both TK signatures, Rachel told Psylocke to join her power with Rachel's. My guess is that the only reason we see two signatures is that the color that would result if they showed both combined would be a hideous brown.
I can't recall any other time that Psylocke's TK has affected anything not matter. I could be wrong, and would welcome evidence of that. But just because she's powerful doesn't mean that she can do things other psis have done, because there are lots of things that others have done that she hasn't.