Big Girl Underpants!

I hope I don't jinx myself but I think we're almost a potty trained household!  I don't really mind diapers especially when you have two little ones.  I'd rather change a diaper than sit in a bathroom over and over again.  Because of my selfishness I let the girls drive this process 100%.  I waited to start potty training until they were ready so that the transition would be much easier.  They were already asking to go potty for 2 weeks before we officially said "bye bye" to our diapers.  We made a big production of throwing out the diapers and saying "hello" to big girl undies.   We had minimal accidents from day one.  Ellery goes 100% in the potty but is in a pull up for naps and overnight.  Emily goes pee 100% in the potty but she won't poop.  She will do it in her underpants every.single.time.  So now I'm struggling...do I keep her in a pull up or just try to catch her in the act?  Unfortunately she is pretty secretive about it and doesn't care at all that she pooped her pants.  As soon as she's done she'll tell me, but she won't say anything before.  I don't think she's doing it on purpose, I think she just hasn't connected the process yet.  In due time I guess, and when she sees her sis without pull ups I'm sure that may help.   All in all the girls have done awesome.   Phew!  I have been dreading this process, but it was much better than I thought it would be and I am almost positive it is because I let them take the lead rather than forcing them.  Pick your battles....words to live by!