Because of her. Paraphrase

Tenacious Learner 'for the reason of her'

That is bad grammar.

I'm here only because of her = I'm here only on account of her

Mister MicawberI'm here only because of her = I'm here only on account of her

Hi Mister Micawber,
Thanks for your reply. '...on account of' would be impossible for the students to understand that.

Tenacious LearnerIs there another one that makes sense?

I couldn't think of one, and the dictionary did not help me.

Mister MicawberI couldn't think of one, and the dictionary did not help me.

Hi Mister Micawber,
How about, 'She caused the reason to be here', a paraphrase for, 'I'm only here because of her'?

TL

Tenacious Learner 'She caused the reason to be here'

Not possible. 'She caused me to be here' or 'She is the cause of my being here' or 'She is the reason for my being here'. But none of those can replace the original text ('because of her'), which should be the measure of synonymy.

Mister MicawberBut none of those can replace the original text ('because of her'), which should be the measure of synonymy.

Hi Mister Micawber,
I have no intention of substituting the paraphrase for the original one. It's just to explain the meaning to the students. Then, are the ones you have suggested correct for that purpose?
How about 'by reason of

Tenacious LearnerThen, are the ones you have suggested correct for that purpose?

Yes.

Tenacious LearnerHow about 'by reason of her' for 'because of her'?

No. That is not possible grammar anywhere.

Mister MicawberNo. That is not possible grammar anywhere.

Hi Mister Micawber,
Thanks! No further question.

A: I'm here only because she's here / she asked me to come, and she's gone to visit Peter!