Everything you are describing is completely normal for a new snake.

The first week or two after you get the snake, it will tend to "lay out" (not use hides). Then once it feels safe, it will start to use the hides all day and all night.

I only see my snakes out of their hides around feeding day.

Just leave her alone for a week or two and then try feeding her. She will not starve and she will not freeze to death if she is at 75*. If she needs to get warmer she will go where it is warmer.