Sorrrrrryyyyy

I know this is a place for pregnacy and other female stuff. BUT I'M CALLING ALL CAT OWNERS... my grandma adopted a kitten today and it's maybe 6 weeks old, 7 weeks old. Something I'm gonna post a picture can anyone tell me how old y'all think she is..

And also she has diarrhea and vomited while she's spending the night tonight and it seems like it really hurts her to shit and to throw up what could be the cause? My grandma fed her soft food. So tonight I went out and got her some kitten hard food to see if she'll eat it and I've had her since 930 and it's 12:20 am right now and she's been sleeping all night and I'm like what's going on.. ya know? So please help I'm worried what could be causing this.