Feeling like a bad mom..

So I’m 22 I’m a nanny for A woman (she’s a sheriff) and I just recently started with her! The shifts are 12 hour shifts so they are either 7:00am-7:00pm or 7:00pm-7:00am! The schedule is super nice because I only work three days one week and then four days the next week, so a total of 7 days in two weeks! Pay is super good and it’s for a 1year old boy and a 10year old girl, she goes to school during the day so it’s just me, little man, and my baby girl for the most part! Well I just feel like I’m being a bad mom for keeping her out late she goes to bed once we get home after our night routine, and sleeps through the night always and usually never cries unless she’s hungry so mainly she’s a happy baby! But soon I’m gonna start doing the overnight shifts which she has a spare room we’d be sleeping in with a bassinet and everything, I just feel wrong for not having her at home? I’m so LUCKY she gets to be able to come to work with me, I guess I’m just feeling down and wondering if I should find a new nanny family to take her with me and maybe an easier schedule?