If I know I'm beat should I fold

[kstamps22]

3/6 hold/em live game.
BB is a hyper aggressive maniac. He has been raising almost every hand, and reraising when someone else raises.
mp2 has just sat down and only played 2 hands. She seems very loose passive so far.
Hero is ep2 with QcQs
ep1: folds
hero: raises
mp1: calls
mp2: folds
mp3: calls
co: folds
button: calls
sb: calls
bb: raises
Hero: caps
everyone calls

Flop: 6 players (24 sb)
9c 7d Jc
sb cheks; bb bets; hero raises; everyone calls; bb reraises; hero caps; mp1 very reluctantly calls; mp3 folds; button calls; sb folds

Turn: 4 players (22 bb)
10s
bb checks; hero bets; mp1 saying aloud she knows she's beat reluctantly calls again; button calls

River: 4 players (26 bb)
4s
bb checks; hero bets; mp1 calls; button folds; bb raises; (mp1 begins getting very distraught and keeps telling dealer "I know my 2pair is beat")