Beware that you do not do anything that constitutes “fronting”. Fronting is where a parent registers and insures their child’s car in their own (the parent’s) name, declaring that it is theirs and having the child as a named driver on the policy. If this is discovered the insurers usually cancel the policy retrospectively leaving the child and the parent open to prosecution for driving with no insurance and possibly allowing a vehicle to be driven with no insurance.
From what you say you do not seem to be proposing to do quite this, but you should be careful of declaring that you are the main driver when you are not. The safest way is for your daughter to take out her own policy with you as a named driver. That way she gets the benefit of earning her own NCD, you can drive her car if necessary, everything is legal and, as sally suggests above, it may reduce the premium a little.