theres nothing wrong in the snake eating the prey items like that, some snakes are just shy... maybe shes stressed out a lil cause shes in a nev inviroment, if she eats without constricting she will eat for you with no problem IMO, the temps tho ... im a bit confused there, are the temps in the tote 90 or just on the hot spot ?, if its too hot for the snake and she has no where to escape from the heat she will stress out...
And yeah you should always heat the rats before feeding the snake so she can catch the heat signature of the prey it makes em crazzy

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Hope anything of this helps, im sure you will get more tips soon from other people too ...
Keep us updated on her and good luck !!!