Jennifer Arnold, Bill Klein and Zoey
02/19/2014 AT 08:40 AM EST
The newest addition to the family of Dr. Jennifer Arnold and Bill Klein of TLC's hit reality show The Little Couple
is ready for her close-up.
"She is a very strong personality," says Arnold with a laugh. "She is a happy girl."
The past four months have been challenging, to say the least, for Arnold, 39, a neonatologist at Texas Children's Hospital
and Bill Klein, 39, a business owner who runs their Houston-based pet store Rocky & Maggie's Petshop
While in India picking up newly adopted daughter Zoey
, 2, from an orphanage, Arnold experienced severe bleeding and had to return home to Houston for treatment. She went through months of weekly intensive chemotherapy treatment
to battle a rare form of cancer
and now is in remission.
The trying months of settling Zoey into her new family, along with their son Will
, 3, are finally behind them.
"Zoey loves riding on cars and Will loves pushing her around," says Arnold. "It is the cutest thing ever."
The new season of TLC's The Little Couple
premieres Tuesday, March 4, at 10 p.m. and will feature the trip to India
and first moments with Zoey.
For much more on Arnold and Klein's past few months, including exclusive photos of Zoey, pick up this week's issue of PEOPLE, on newsstands Friday