My tenant stopped paying rent...

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Hello, 

I live in Montgomery County, MD and about 3 month ago I rented my basement to a single lady. I gathered one month security deposit and first month rent at the day of moving.  After the first month she stopped paying rent so I sent her emails/texts asking about the rent. Her rent is due on 1st day of each month. After sending several emails she finally gave me a very small amount with a check with 16 days delay and she promised me to pay the rest in couple of days. Today is 29 and Im still waiting for my rent. I sent her several emails but she keeps promising me to pay. What should I do? I already dropped all the late fees to keep her happy so I can get my actual rent. 

I really want her out of my apartment but I've been told if I go to court it might take up to 3-4 month. 

What should I do?