QQ is only dominated by KK and AA. You're favorite over AK and worse hands. The raise looks too big for me to be AA or KK and more a hand like AJ-AK, AJs+, KQs+ and medium pairs up to JJ.

Since the EP limper folds most of the time to raises he could also be raising any 2 just to pick up an easy pot since only 3 ppl are left to act behind him + EP.

I think you're WA here and should be pushing, EP is most likely going to fold and I think you're ahead of CO's range here.