Britney Re-re-rehabs

I guess Britney has entered Malibu's Promises rehabilitation center for the second time (her third stint in rehab this week). Do you think she has a drug/alcohol problem or is it more of a mental instability such as a nervous breakdown? I'm sure she's using alcohol/partying as a way to hide from her problems, but I really think it's the stress of her failing career and the general disarray of her life that's causing her to freak out. She was so successful and she's just become the laughingstock of the whole world. Everyone she knows uses her to profit in their own way, including the father of her children, her ex-boyfriends and even the sleezy people who own the salon where she shaved her head. I feel very sorry for her.