01/04/2008 at 03:15 PM EST
's mother is asking for "prayers" following the news of her daughter's hospitalization
On Friday, Lynne Spears was "extremely distraught" on the phone, and said, "Just say prayers," when reached by Access Hollywood
Lynne, who's been in constant contact with Britney, and 16-year-old sister Jamie Lynn have been in seclusion following the December bombshell
that Jamie Lynn is pregnant. The two were spotted Friday afternoon arriving at their home in Kentwood, La., from an undisclosed location.
Meanwhile, the whole family is "terrified" about the situation, a source close to the family tells PEOPLE. "Everyone has been worried for some time," says the source. "Her world has been crumbling around her and this is another call for help. Her parents are just devastated. Nobody knows if they can take much more, but they're trying to be as strong as they can."
Spears's father Jamie was at Cedars-Sinai Medical Center Thursday night, and her older brother Bryan was expected to show up Friday, according to a source.
Another family friend, Spears's former dance teacher Renee Donewar, tells PEOPLE, "I don't even know where Britney's head is. I thought she had already hit rock bottom. I can't imagine what's next." (PHOTOS
: Britney in the ambulance
Donewar says she believes Britney will (and should) lose custody of her kids.
"She keeps digging herself deeper and deeper," says Donewar. "How can anybody say, 'She's been through a rough time and she should have her children.' She is not in a state of mind to have her children. She's confirming everything bad that people think. It is really a shame."
She added: "[Britney] was such a level-headed kid, she knew what she wanted, and she was determined to get it and to make it. Now she has it, and what is she doing with it?"
Added another family friend: "I just hope she'll pull out of this and get on the right road to recovery. A good rest here in Kentwood might do her some good."
By JENNIFER GARCIA, ALICIA DENNIS and RUTH LANEYKeep checking back to PEOPLE.com for the latest updates