Mindy McCready's drunken driving charge will be heard by a grand jury.

The country singer appeared Tuesday for a hearing, where attorneys tried to get the case thrown out by discrediting the field sobriety test she was given.

If the grand jury returns an indictment and McCready is found guilty, she could spend a minimum of 48 hours in jail, as well as serve 11 months and 29 days probation.

McCready, 28, had a No. 1 hit in 1996 with "Guys Do It All the Time," but has suffered a series of legal and personal problems in the last year, including two suicide attempts.

Her boyfriend, William McKnight, was charged with attempted murder in May after he allegedly broke into her home and assaulted her.

McCready said last week that she still loves McKnight and has been with him since the attack. She said she became pregnant by McKnight unintentionally in July and is carrying his baby.

Last year, McCready was convicted of fraudulently obtaining prescription painkillers.