Is this chick alright?

This batch of chicks hatched late February and are around 7 weeks old. I dont live at home but i come every weekend to take care of the animals and make my moms life a little easier. This is also our first batch of chicks ever (we’ve had chickens for over 11 years 😅 we got new hens last December after the old ones passed away) and they all seem to be very healthy except for this one. Its been about 3 weeks since i noticed her struggling to keep her balance and when she fell she sometimes had a hard time getting up and needed a helping hand to get up, she walks slowly and carefully, shes almost always shivering and is under the heat lamp the most. She does drink, eat normally and her poop also looks normal. And recently she hasnt been falling as often but she still seems to be really cold and we’ve done pretty much everything we can to make it warmer for her.