It's better to get her to start eating a couple meals first, before offering f/t, if it isn't working anyway. That way, you know that she CAN eat and she isn't refusing food for a different reason. Also, avoid handling her at all until she eats at least once.
Handling does cause a level of stress, which can lead to not eating, which is why it's recommended to not handle a new snake until they're consistently eating. Snakes really don't always give off obvious indicators of stress.
The hot side should be between 90~92. Are you using a thermostat with whatever heat element you're using?
The humidity could be higher. Maybe post a couple pics of your setup?