Wow...we should get our lo's together so they can party. Our guy is 11 months and about 3 times a week for the past two weeks or so he's been partying too. I don't go in because that would be worse (in our situation) He jumps, laughs, etc. Like yours, he doesn't cry. Our son will do this for about 15 minutes or so and then that's it. I know what you mean though about not being able to sleep through it.....dh has no problem though!
Anyhow, yes, I would look at her daytime sleep. If she is getting too much or maybe not enough activity time, the perhaps that could be tweaked as Katet suggested. Our son, however, has two naps totalling 2 1/2 hours usually and he's on the go all day. He's also a 7 to 7 sleeper so I'm going to assume this is a phase.
What would happen if you didn't go in to settle her....would she fall back on her own? I'm sure that if this did go on for a long time then she would need you to repeat this strategy every night. Yes, I know that sleeping through this is impossible but I think leaving her is the best bet if she's content. But that's just what I think.
Also, has she started crawling, walking, pulling up, etc lately? I read somewhere in Tracy's book that babies at these stages wake with muscle spasms that they can't control and therefore party for a bit. HTH
Zelka