Mom thinks I’m not a ‘good’ mother?

I’m 25 and had a baby last September (she’s 7months). This was a surprise but a welcomed surprised so my parents were over the moon happy. The first 3 months my mother offered to help me with the baby. I basically only carried her to feed her basically that’s how much my mother was involved carrying her. Anyways I started school this semester and I usually go to my room( I live in the back it’s like a studio) and work on my assignments and all that. Well lately my mom keeps saying things like “ yeah that’s why it’s important to be in your child’s life 24/7 and just not go to school or work to be involved” and I’m like well yeah I wish but I have school work sometimes and she just gets quiet. She also knows that I start my online classes at a specific time and lately she’s been coming home at a later time which I mean I don’t care I can watch over my baby and do homework no problem. It’s kind of like shes over/done with taking care of my baby all the time and honestly It probably sounds bad but I got comfortable with her taking the baby off my hands so I can get work done.

I would LOVE to be with my baby 24/7-I am actually jealous of her relationship with my mother.

in a couple weeks I will be completely free to be with my baby all the time but at the moment I am in school.