Supplementing

Okay so my daughter is almost 6 months old and I went back to work 2 weeks ago. She's been EBF until now and at work I can pump 3 times but I have a long commute so I can't do the last pump until I get home and by then I have to nurse her. At the sitters shes been drinking roughly 1-2 servings more than I make and went through my freezer stash quickly. 😢 She does paced feeding and I drink lots of water and even took a supplement for awhile to boost my supply but I haven't caught up. Her Dr. said it was ok to give her formula but I'm just terrified it's going to create the cycle of her wanting formula and bottles and me not producing enough. I guess what I'm asking for is experience with starting supplementing and encouragement. Is it better to do one bottle of formula a day or do a few that are mixed with breast milk? Thanks!