Intruder Alarm is “2U, random opponent discards a removal from hand” in this deck, because if that doesn’t happen, I flat out win. Very many of my loops are based on creatures ETB/LTB – usually one of the X creatures with X=0 does the trick, or some mana producing creatures and Ancestral Statue.
So no, Intruder Alarm never was a liability, because so far I haven’t seen the game progress with it on the board beyond my turn, one way or the other 😉
Her combo plan plays a lot like Teshar Loops, just trading the silence effects for counterspells and draw effects. Was by far my best performing list at Bologna, and most wins weren’t on the first combo run, but required (and were able to do) multiple runs at winning. So games were really fun, even for others at the table – in two cases my opponents and me discussed the board state to find out wether I did or didn’t have infinite, then proceeded to find the best way to stop it to see if I could get through with my grip of interaction or not.