Transitioning from EP to breastfeeding

Hi! I started a journey to transition myself and my baby to breastfeed instead of bottle feeding with my breast milk. I am still struggling with my baby to latch and I am afraid my breast milk supply will drop. Should I keep pumping after breastfeeding? How do I know my baby had enough?

I am currently starting with a nipple shield and baby stays on breast for about 15-20 minutes.

I have a small stash of breast milk on the fridge, just in case i need to offer her a bottle in a moment of despair.

My fear is that I stop pumping and she is not getting enough from my breast and then my milk supply starts to drop. I do not want to jeopardize my breast milk supply as for me the most important thing is that my baby gets my breast milk for as long as possible.