Yes of course! Aslong as that is not too low for your height they will help you reach your goal. Many people on Slimming World are down to 8st or lower for shorter people. It depends a lot on height, i am 5ft 7in and would never aspire to reach 8st as i would look poorly! I have dieted down to 9st a few times but find that 10st is my best so that is my goal

People of all shapes and sizes are in every kind of diet group, From those only needing to shift the odd few lbs, to those in it for the long run to shift a lot.
Good luck xx