I'm having a hard time getting lo back to sleep for her 2nd nap. She wakes at 45 min everytime. Sometimes she will fall back asleep by herself, sometimes I go in and she will, but mostly, she screams for a long while and never falls back asleep with me in there. It's been going on for about 3 weeks now. It makes her grumpy and her bedtime starts too early. She sttn and her first nap is 1:15-1:30 long. Any advice?