Precision: she had an X-Force fight. You know, the kind of fight Cyclops insisted it should be a secret, even for their X-Men teammates. So, after having some Purifier blood bath, instead of taking a shower in X-Force's "HQ" (one of Warren's houses), she came back to Graymalkin Center, took a shower and put her bloody towel in front of Miss Gossip. That's the only way great writer Matt Fraction could figure for Emma to discover about X-Force.