*She does not only love her mother, does she also love her father.
Your example is ungrammatical because the first coordinate is declarative and the second coordinate is interrogative (and has a missing question mark). Is that what you intended?
"She does not only love her mother, does she also love her father."
Convoluted construction. Why not simplify and recast as follows:
She loves not only her mother, but does she love her father also?
Because your solution is flat wrong, that's why! I have already explained that the example is ungrammatical because the first clause is declarative and the second one interrogative. Examples like this with "not only" are a special case of negative + positive coordination. But such coordination does not permit negative + interrogative coordinates.
"Does not only love her mother" is negative, but "does she love her father" is interrogative, which is why it's ungrammatical.
In future, please do not confuse questioners by giving incorrect answers.
She not only does love her mother, she also does love her father.
In this sentence, does the word "does" emphasize the verb "love"?
Thanks a lot.
It emphasises the existence of her love. One might use that sentence to dispel any doubt in someone's mind as to whether she really does love her father as well as her mother.