[Ria P]

I wouldn't take her food bowl out if she's blind because she'll know where it is. Hamsters usually only eat what they need but like to hoard food so the food that disappears from the bowl doesn't always get eaten.

You can make treats and toys by coating for example a cardboard tube with a mixture of flour and water and then stick some of her mix, seeds, herbs etc on it, let it dry and put it in the cage for her to find.
A small box with holes and a couple of seeds in it is popular or a cardboard roll with slits and seeds stuck in them. There's lots of stuff you can make to keep her entertained.

Have a look on youtube for ideas to make hamster toys with added food.