Can u claim bankruptcy if you just spent all your money on frivolous things?

My friend has a decent paying full-time job. Over the last couple years, she's been spending like a maniac.... designer clothes, drives a BMW, tanning, nails done, hair done, lavish vacations, etc. She has charged up a ton on credit cards and hasn't been paying them. She's about to lose her house, her car, and creditors won't stop calling. She told me she's gonna just claim bankruptcy. Can she do this just because she blew her money on unnecessary stuff and didn't pay the bills? It makes me upset because I work full-time, drive an old car, and struggle to pay my bills while NOT buying new clothes, getting nails and hair done, etc. Can she actually claim bankruptcy in a case like this?