Same thing happened here with our DD who was just over 2.5 when DS arrived. Not so much with going to bed at night, but night waking.
I can't say any one thing worked for us, it was just a matter of time. We let things run their course for a few months (all the while pulling our hair out) and then decided after a few months to get really firm with her sleeping in her own bed (don't have an issue with co-sleeping as such but none of us were sleeping!) and that was that.
Hang in there girls, it's a big adjustment for them and it WILL pass. It lasted a few months here and then things settled right back down and we got our great sleeper back.
In hindsight, we were pretty lucky this was our only hiccup, she was very accepting and welcoming of her brother in every other way...didn't feel lucky at the time though! LOL
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