How do I handle this parent anxiety?

I babysit this 18 month old girl who's parents are asking me questions every day. The little girl seems to cry every time they get close to my house for drop off. I have no clue what the problem is. I feed her breakfast as soon as she gets here, give her a cup, usually check to see if she needs changing, and then have little activities to do with her. She has limited language ability and I can only understand "Mama" and "Dada". She is standoffish and seems to just want to play by herself. She is an only child. I read her books before nap time. I even wash and braid her hair once a week and only charge $85 a week. I feed her breakfast, lunch, and a snack every day, plus give her milk and Calcium fortified juice. I am also working on potty training this little girl. She is very funny about eating. She seems to only want sweet things and I fix foods from scratch like veggies and spaghetti, tacos, mac and cheese, etc. Her mom asks me so many questions every day. Like, why is she crying when she comes here? Why is she so hungry when she gets home? If she is being potty trained, why does she have a rash? I don't know the answer to most of these questions? Now her mom wants me to call her every 2 hours so she can talk to the little girl. I really feel offended by all of the questions and wonder if I should just tell the mom to take her somewhere else where there is staff that can give one on one therapeutic attention to her daughter. I am a SA HM of 2 other kids and just thought I would help this woman out. Also, this little girl spits out food on the floor when she doesn't like it. She whines all day for her parents. She stands at my front door, whimpering and crying for her parents. Is this normal? How do I communicate to her parents that I spend more time with their little one than I do with my own all day and she still has this anxiety. Mom wants me to call and text pictures to her every hour or so. Are these parents wanting too much from a SA HM that only gets paid $85 a week? HELP!?! Please, any advice would be appreciated!