I don't think this is an easy fold after the flop in a $3 rebuy. I probably check push with any two diamonds larger than the 7s myself. In a freezeout your right and the hand is probably beat.

Also you have the ace of diamonds for a runner runner flush and you have 2 aces you can hit. Not good reasons to call but the fact that if you call and lose another $6 puts your stack right back to where you are now.