For a 6 quarts tub 90 is too hot lower the temp to about 86/87
If you have not done so already provide aspen as bedding it will increase security.
Once you do that give it a week and offer live hopper mice (forget rats, forget f/t)
Assisting is always a personal call but there is no set amount of time it depends on a few factors, like yolk absorption, general look, health etc (I usually don't consider assisting before 6 to 8 weeks) and before resorting to this there are a few tricks worth trying such as loose newspaper in the tubs, brown paper bag trick etc (braining does not work with BP)
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