Maybe she should keep off the grass?

Troubled Teen Mom 2 star Jenelle Evans has had a string of bad luck lately, from violating her probation by smoking marijuana just a month after leaving rehab, to falling while walking into court, but the worst is still to come.

RadarOnline.com has exclusively learned that the 19-year-old may wind-up doing some hard time for recent her probation violation.

PHOTOS: Jenelle Takes A Tumble

Her attorney Dustin Sullivan told RadarOnline.com: "Jenelle is for the first time facing actual jail time.  She could go to jail for 45 days," after she tested positive for THC on July 13 and admitted to smoking marijuana.