It might help to pump a small amount between feedings. Not only so you have a little extra around, but also because it will give her body feedback to produce more.
This should be done carefully. A large oversupply can cause mastitis which is truly an awful and potentially dangerous experience. Donβt aim for a lot extra, just see if a little boost and a little extra helps.
Make sure the pump flanges are the right size, too. You may have to order the correct size as it may not have come with the pump.