If you want to continuing assisting her through the transition bardos for the traditional 40 days after her death, consider using the Phowa practice listed below for that process.
Simplified Tibetan Phowa Practice
1. Invoke and Visualize in the sky above the dying or deceased person, the embodiment of whatever truth you believe in, in the form of radiant light. Choose whatever divine being or saint you feel close to. Simply fill your heart with that presence and Trust that it is there.
If you don’t feel linked with any particular spiritual figure, imagine a form of pure golden light in the sky before them.
2. Imagine that the presence of light sends out love and compassion in a stream of rays of light from his/her own heart.
As these touch and penetrate the dying/deceased person, they cleanse and purify their negative karma, destructive emotions, and obscurations, which are the causes of suffering. You see and feel that they are totally immersed in light.
3. Imagine the dying/deceased person now completely purified by the light streaming from the presence. Now See them Dissolve Completely into Light and soar up into the sky and merge, with the blissful presence of light.
4. Do this as often as possible when you think of this person.