Under the watchful eye of physical therapist John Noonan, she next works on the stairs.
On a living room table are a children's reading book and a page of simple subtraction problems that Mofya completed earlier in the day. She reads and writes at about a fourth-grade level.
"She still laughs and goofs off with Jaime," said Pat Abruzzese. "It's kind of got back into the same pattern except she doesn't stay with us on every topic like she used to. We do have to remind her what's going on."
Mofya sits quietly and smiles sweetly as she answers questions with a few words. If she is angered by what happened to her, she doesn't let it show.
"I'm very happy to be home," she says slowly, carefully picking each word.
Her doctors say it will take up to a year to determine how much permanent brain damage she suffered.
They recommended that she enter a special rehabilitation program for people with brain injuries at Northridge Hospital Medical Center. The hospital initially turned her down because she had exhausted the limits of her private student's insurance and is covered by an emergency Medi-Cal health program, Joanne Abruzzese said.
The couple sparred with hospital officials for weeks, finally gaining admission after appealing to Northridge's parent company, Catholic Healthcare West. Mofya began the program last week.
It's only the latest battle for the Abruzzeses since Mofya's accident. There have been endless forms to fill out, doctor's appointments to get her to and the struggle to make sure she is never left alone.
Both Pat and Joanne Abruzzese hold full-time jobs, so they have enlisted help from paid aides, therapists and friends.
"It's not a burden, but it does take time," Pat Abruzzese said.
Martha Mofya visited recently and the two sisters fussed over a wig that Mofya was wearing and talked about their life back in Zambia.
Mofya says softly that she wants to go back.
But her plans have changed.
She no longer wants to start a skin-care business. She wants to help people with disabilities.
Her sister, sitting beside her, slips an arm around Mofya.
"Life is full of circumstances. It's up to you how you challenge those circumstances," Martha Mofya said. "Racheal's up for the challenge."