Light two black candles and chant:

In the name of the Gods and all ye Spirits
In the name of Kernunnos and the light and the dark
And the Gods of the Netherworld
And whosoever shall be casting a curse against me
Let them suffer their own curse
Let these candles be their candles
This burning be their burning
This curse be their curse
Let the pain they have caused me and mine
Fall upon themselves

Do this spell for five consecutive nights (as close to midnight as possible) and each night
chant the spell until the candles are spent.

Lemon Uncrossing Spell
(to break a curse)

In a sachet, combine the following herbs: St. John's Wort, sage, calamus and dragonsblood powder. Set the sachet aside for later. Fill an incense brazier with dragonsblood incense. On your altar, you will need an athame, a whole ripe lemon, 1 white and 1 black candle, a bowl of salt and a bowl of water. You will also need a glass or ceramic plate to set the lemon on when you are done. Do not use paper or wood.

Light the candles and the incense. Hold the lemon in both hands and visualize it magnetized and drawing the negative spell away from you. Dip your athame in the water then slice the lemon into three pieces. Set the athame aside and visualize the lemon drawing the negativity away from you and into the pulpy fruit. Repeat the following:

As sour as this lemon be
Charged and cut in pieces three
With salt and water I am free
Uncross me now, I will it be.

Let this lemon do it's task
It's cleansing power I do ask
As this lemon dries in air.
Free me from my dark despair.

Uncross! Uncross! I break his curse.
But let not my simple spell reverse.
I wish no ill, nor wish him pain
I wish only to be free again.

Take each lemon slice and dip it in the salt, making sure it is well coated. Set the slices back on the altar and say:

As it is my will, so mote it be!

Leave the lemon pieces on the altar where they can dry. Once dry the spell is complete and the lemon can be thrown away or buried. If however the fruit rots instead, you must repeat the spell. While waiting for the fruit to dry, keep the sachet with you at all times. It will help to protect you from the effects of the spells and turn away any negativity sent in your direction.

Purification Spell (To Break a Curse)

This is a "heavy-duty" purification spell.

On the night after the full moon and just before bed, light 13 candles, preferably white. Fill the tub up with hot water (as hot as you can stand to sit in). Add 1 cup sea salt, 1 tablespoon sage, 1 tablespoon lavender and 1 tablespoon chamomile. Turn off the water and let the bath steep in the herbs. Kneel or sit in front of the tub, in the nude, and repeat this incantation:

What was done was done
Be it now undone
By the light of the full moon's wane
Cleanse my soul of taint and stain
Let now my hurtful spell reverse
And lift from me this vicious curse
As I enter now this sacred space
Return my spirit to it's grace

Enter the bath and let the water cleanse away the effects of the curse. Use your hands to gather up the water and pour it 3 times of your head. Each time you do, repeat:

Accept my apologies for what was done
Disperse my spell with the morning's sun

Remain in the bath until the water cools. Drain the tub and rinse off. Snuff the candles and go to sleep. By dawn the curse will be broken and you will once again find that feeling of "blessedness" that you lost.

Maybe you should get a professional to read your tarot and find out from them what the best course of action is.  Do not tell them why you are there they should be able to see it in your cards and then give you advise to the best course of action.  If they do establish that she is cursed require whether she must try to break it herself or seek outside help.