Baby seems like ok if I am not hold/with her....

I read so many November babies already can't leave from mom, but my LO is gonna be 4 months in 3 days, but she seems like ok if I'm not with her or hold her. She tracking me almost the time if she see me walk around. I'm stay home mom and with her all the time, I put her down to sleep every night, she seems happy when I play with her or talk to her, also she showing me a lot smile too, just not feeling she know I'm her mommy yet. Does it is normal?