Ok, she works with the Lotus Sutra and does mantrayama (chanting). A friend of mine does Nichiren as well.
(Mis)se chants from the Lotus Sutra to do this. Shakyamuni’s words won’t go awry, their his words and have power - even if you filter your own meaning through them.
In meditating position at your altar, chant this for around 20 minutes:
Sho I Sha Ga Nyo Rai Ho Ben, Chi Ken Hara Mitsu Gon Ji Nyu Nan Ek Ka Shu Shin.
(Because I have the power to employ skills, And the power to perform those teachings so gently and skillfully that living being are delighted).
Then skry a photo of your ex on your altar. Stare at it without taking your eyes off the page, and chant the following for 30 minutes or so:
Gen kai e ren bo, Ni sho katsu go shin, Shu jo ki shin buku, Shichi jiki I nyu nan.
(They adore and admire me, they become devout, upright and gentle, and wish to see me with all their hearts).
Continue until you get a feeling of connection with him. The photo should begin moving around on the page like it’s alive. Then tell your man to come back to you.
Continue chanting the 2nd mantram for 10 minutes or so until you feel all is calm.
It should take around an hour to do all of this, maybe more.
The key to the chant are they must be rhythmic. If you have to, record yourself saying them, and play them on infinite loop over music as you repeat them. Make sure each syllable is on a steady rhythm.
The key is for you to enter the flow state. Buddhism works with flow states rather than trance states.
Let us know what happens.