DD is nearly 21 months. She was, up until about a month ago, doing a 2-2.5hr nap from 12:30-2:30/3:00 (BT about 7pm, WU about 6:00/6:30am - her choice, not mine). Last month we went away for our anniversary for two nights and left the kids with my parents, who they know very well and spend lots of time with. My mom said she didn't have any major problems with sleep, but ever since then DD has been cutting naps short and waking up crying, which was unusual for her. Generally she wakes at 2:00 with me putting her down at 12:30. Today she woke at 1:30. I have tried resettling by patting her back and shushing (which works at night) and wiwo most recently with no success. I'm wondering if maybe it's just a stage to push through (SA) or if I have the timing off. Should I be putting her down later? She has been on the lower end of sleep needs, but never extreme the way her brother was, and used to wake up happy and chatty. Any ideas?