Hi Luckymee.  The Maryland Mandatory Kindergarten Attendance Law stipulates the following requirement:
 
"a child who resides in Maryland to attend a public or nonpublic kindergarten program regularly during the school year before entering the first grade unless the child is enrolled in an alternative program or is receiving home instruction..."
 
You can read more about the law at the web site below.
 
A strict interpretation of the frequently asked questions from that website would suggest that parents are not allowed to accelerate their child by enrolling them directly in 1st grade, but you should speak directly with your school district to confirm if this is a possibility for your child.  You may also want to inquire if there are any k-1 programs at your school that combine a kindergarten and first grade class under the instruction of one teacher.  These are common in the public schools in our area.
 
An additional factor you may want to consider in your decision is the social and emotional benefits your child might receive by attending kindergarten.  In today's society we put an increasing amount of emphasis on academic performance at an early age.  But adapting to the social environment at school and getting along with ones peers is also a major hurdle that kids must overcome in their first year at school.  Dealing with this challenge in a Kindergarten class may be much easier for your child, especially given she will be one of the younger ones enrolling.  Good luck!!