(1) South: "I think that's alertable"
(2) After looking at the convention card, intended as a cue-raise of spades
NS convention card has a system of two-suited overcalls of weak twos, including 2NT to show the two highest ranking (I think a cue-bid and 3♣ showed the other combinations)
Result: 3♥ (E) -6, NS +600
I think West claimed damage because 2NT wasn't actually alerted, just sort-of alerted, so she wasn't sure how East intended her bid. Anyone interested?

Help

2♠..2NT(1)..3♥(2)...P
..P....P