Separation anxiety?

So my 4 month old old gets really fussy when I leave her with her dad so I can go to work. And not like just kind of fussy, like he calls me and I can hear her SCREAMING! I’m starting to think maybe it’s separation anxiety. She doesn’t act this way when I leave her with my mom or his mom and I feel like that’s because she’s used to being with them. She acted this way when I left her with my moms boyfriend one time and I was only gone for like 45 minutes. Does anyone have any tips or tricks to help my poor baby? I can’t stand to hear that through the phone and knowing she’s SO upset! Please help!