One of the features of an emotionally gifted/balanced/well-adjusted person, is their ability to use all of their mental powers to bear on a problem, without letting their wishes or fears overwhelm their intellect. Plenty of high-IQ people with emotional issues who do not do as well in living a happy and productive life. For example, figuring out what careers are both plausible and reasonably rewarding (financially and otherwise) is not actually an intellectually difficult one, but plenty of people screw it up because they let envy, shame, fear, greed, or other emotions get the better of them.
Your role would be to let her use her talents to make reasonable, well-adjusted choices in life. If she never gets a high IQ, that's not a big problem, as long as she isn't trying to pretend she does, in order to avoid disappointing a loving but emotionally "morose" parent. If she chooses a life that does not require a high IQ, she can still be happy and productive. If she ever needs to make any decisions that require differential equations, she'll have plenty of friends she can ask for help on that.