I mentioned this in my post above, but your foot size may be the most important factor here.
5'2 riders rarely come with big feet
159 snowboards are typically made for male riders with average to large foot sizes.
The board that you have has a waist of 25.4 cm. It is likely in the neighborhood of 26.4 at the inserts where you will ride.
26.4 cm is the same length as a men's size 8.5 shoe, but you will be riding with some angle so you can figure that the minimum shoe size for your board is about a men's 9 (women's 10.5).
If you have smaller feet than that, it will be very difficult to control and learn on this board.
Please measure your foot using this method:
Kick your heel (barefoot please, no socks) back against a wall. Mark the floor exactly at the tip of your toe (the one that sticks out furthest - which toe this is will vary by rider). Measure from the mark on the floor to the wall. That is your foot length and is the only measurement that you will want to use. Measure in centimeters if possible, but if not, take inches and multiply by 2.54 (example: an 11.25 inch foot x 2.54 = 28.57 centimeters).
PS: I think it is AWESOME that you are getting more into riding. STOKED for you! Welcome to the best sport in the world.