Is it normal my mother redirects everything back at me?

My little sis has some issues. My mother's older so I understand she'd have trouble being there for her. Now I'm not heartless, I don't insult my little sis in front of her. But I do go to my mom to express my concerns. And she always turns everything I say back on me.

I'll say "She should get more sleep, she's ten and sometimes she turns in at midnight"
My mother will say, "Maybe you should get more sleep! You pulled an all nighter or two in college!"

I'll say "She should eat less snacks. Her bmi is over 30, she's going to get sick."
She'll say "Maybe you should look at yourself. You eat way more snacks than her!"

Yes, I'm not good with keeping track of my sleep schedule. But I'm an adult and my little sis is 10. As for the snacks thing... I'm the healthiest person in the family with a bmi of 21 (and I rarely snack.) I come to my mom with real problems and she not only changes the subject but spits an empty criticism at me.