Feel Like My Baby Doesn’t Love Me

I know I will sound crazy, but I just don’t know what to do. First of all, let me say that I love my little one MORE THAN ANYTHING! She is the most wonderful little girl and I adore her. But, I’m concerned that she isn’t as attached to me as she should be. She doesn’t cry when I leave her or seem too terribly excited when I come pick her up from my grandparents after work. I guess I just expected her to be more affectionate than she is. Now, I’m wondering if I’m doing something wrong. I play with her from the moment I pick her up until I put her to bed most days. When I’m not working, I am her primary caregiver and I love every minute of it. But, she doesn’t really like for me to hug on her or hold her a lot. She seems to prefer my mother in law more than me, which really makes me uncomfortable and sad. Could I be expecting too much of her at nine months old? Or could it be that she hasn’t bonded with me? I even worry that maybe she doesn’t realize that I’m her mother since I’m not with her during the day. I’m a teacher, so I’m usually not with her from about 7-4 each day. I’m so sad about it. I feel like I’m failing her.