Jen Arnold Begins Inpatient Chemo in Cancer Fight

12/27/2013 at 02:00 PM EST

Jen Arnold Begins Inpatient Chemo in Cancer Fight
Jennifer Arnold
Courtesy Jennifer Arnold
The smile was still there but when Jen Arnold Tweeted a pic of herself from the hospital on Friday, you could see something that wasn't – her hair.

"Day2 inpatient chemo- sleeping a lot, liking new anti nausea med this time, & looking to get home today! #GetWellJen," wrote The Little Couple star, who's fighting a rare form of cancer.

Jen Arnold Begins Inpatient Chemo in Cancer Fight| Cancer, Health, The Little Couple, Jennifer Arnold

Bill Klein and Jennifer Arnold on Dec. 6

Brian Doben

Arnold's chemotherapy had been postponed for a week due to low blood counts, but she said there was a silver lining to that – "a better Xmas."

That gave Arnold a chance to spend time with her family, including children Will, 3, and daughter Zoey, 2.

She baked Christmas cookies, shared a cute pic of Will with Santa (Arnold's dad dressed up), and enjoyed a traditional Italian seven fishes Christmas Eve dinner that her husband, Bill Klein, whipped up.

"There are moments I feel just terrible," Arnold, 39, told PEOPLE earlier this month.

"I can't believe it is happening. Other times, I feel like this is just a bump in the road."

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