Normal 3 yr old behavior or red flags I should paying more attention to?

My daughter is a few weeks shy of 3 years old and whereas I know in my rational brain that she is probably a normal toddler, there are a few quirks I am starting to notice that make me concerned and I am not sure I should be. Sorry, long!First of all, most of her behavior is normal: happy, occasional tantrum when she doesn’t get her way, great sleeper, loves outdoors, toys, etc. Very helpful, likes to assist with simple chores and tasks, such as vacuuming and putting clothes away. We read a lot of books and she can identify about half of the letters on sight and is good at memorizing words on pages she knows well. Can play simple board games with us (like the Haba first games with easy rules, dice, movements, counting), count to about 30 and can do puzzles that are ~48 pieces. Has a bunch of kid friends at daycare. So all in all, happy and developmentally fine.But it’s her emotional side that concerns me. She HATES loud noises (fireworks, no!), gets ‘scared’ easily by images or situations on TV where the characters appear even mildly anxious and asks us to skip those parts. She is incredibly whiny and clingy. We are trying to encourage her to play more by herself with her toys and even in our enclosed backyard but if she can’t see us for more than a few seconds she starts to panic a little. She doesn’t like anyone other than her primary caregivers (me, dad, her primary babysitter, her teachers at daycare) and we can’t leave her with friends who have kids for babysitting without her losing her mind. I thought about getting a gym membership with one of those kid areas but there is no way I could leave her there without her freaking out.And she has a few little quirks, like she needs to be wearing clothes or she gets upset. If you put her socks on without her looking in between each toe she gets upset. If you read a book a different way than usual she gets upset. She also is late to potty train even though we’ve been trying for about six months now, using charts, stickers, bribes, you name it. She has always been a constipated kid, so we think it’s a little bit of fear, but it seems like she is so stubborn she will never learn. Not interested. Trying to make her sit on the potty and she gets upset. If she can’t perform a task she’ll say “I just can’t do it!” and throw it down.But the biggest thing that concerns me recently is that she can’t repeat back something I just told her. I say “after this we are going to put on your pjs” and she says okay but then I ask her “what are we going to do after this” and she can’t answer. Looks lost, says she doesn’t know. I repeat myself and she can’t repeat back. Finally gets upset and cries, like I’m a mean high school teacher giving her a pop quiz. She couldn’t remember the name of the main character in her favorite movie this morning (Wall*E, calls both robots Eve).Should I be worried?? Or is this just a stormy patch of toddler development? Her ped appt is coming up so I will ask there, too. via /r/Parenting http://ift.tt/2nTKGIj