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After overcoming ovarian cancer twice, MTV reality star Diem Brown once again faces another battle-and this time, against colon cancer.

She was filming a new reality show abroad when she collapsed and had to be airlifted to New York where she underwent an emergency operation on Sunday, People reported.

"Doctors found one tumor blocking her colon completely so they had to do emergency surgery that evening to remove the blockage," Brown's sister Megan tells PEOPLE. "They were able to remove the mass, but once they were inside they found out there were multiple tumors."

Megan related that the doctors discovered multiple tumors and that her second surgery had resulted in an infection in her abdomen. However, Brown, 32, is now in a stable condition but she has to be under close monitoring in the ICU at a New York City hospital where she's expected to stay for two weeks.

"The second surgery was two steps back," says Megan. "But hopefully in the next few weeks she'll be well enough to start chemo."

Megan also added that her sister has been in and out of the hospital and she has to be medicated once in a while but she can see that Demi is displaying courage in her situation and is expressing so much hope.

"This time around has been the scariest build up towards my cancer journey. Both mentally, physically and emotionally the most traumatic. I've been needing some hope to fight for, some light to look forward to at the end of this journey. I find that strength in my family, friends and fans. People I've never met believe in me, I can't let them down! I won't." Brown said in an exclusive statement to E! News, given via her sister

"This is the third time she's had to deal with this and she's ready for it. It's definitely an uphill battle, but I know if anybody can do it it's her," Megan says with optimism.

Her family and friends, including E! News Correspondent Alicia Quarles, have set up a donation page on MedGift.com, a registry Brown started to help those suffering from illness. As of Saturday, more than $7, 300 out of a goal of $30,000 has been raised.

"Any item that can help reduce one ounce of stress, they can register for it," Brown says in an interview view with FoxNews last 2012. "It takes the pride out of asking for help."