I find that a hands off approach works very well toward the larvae if the tank is established and planted.
If it's a fairly new tank, you may need to make infusoria for the larvae though. It's pretty easy, just take some dried grass and let it sit in clean, treated water for a day or two. The water gets a bit cloudy and you can feed that to the larvae via a dropper if you have them in a smallish tank with little filtration. If they are in a larger tank it's going to be harder to get the food to the larvae, and if you're filtering heavily it's going to suck up much of the food that they want to eat.
Best of luck! You may lose this batch, especially if it's not an established tank she's hatching into, but she'll berry again and you'll have another chance soon enough.
