breastfeeding vs formula

So I started breastfeeding my little girl but she started losing weight because I wasn't producing enough milk so I had to give her formula to get her back to her birth weight. Now that she's back to her weight I'm trying to get her more on breastfeeding but she's only on it for a couple minutes and she's wanting the formula. I try to do half and half by start breastfeeding then formula then back to breastfeeding until she falls asleep on my breast. I want to only breastfeed but I'm starting to worry that she is going to refuse my breast and only want formula. Is anybody out there experiencing the same thing? My baby is 4 weeks and 4days. Do y'all think I can slowly take her off formula? How can I get more milk production?