Condoms are designed to break open completely when they fail, there is no such thing as micro holes, which is an urban legend. So since it didn't break open then it didn't fail and therefore the wetness you felt was hers. Good job on using the condom, cause so many others here don't and then freak out about it after the fact when they should have made better choices ahead of time.
If it was semen, yes. If it was her own natural fluids, no. 15 minutes is pretty long to ask a condom to do perfect service. Where is she in her cycle?