Making it more difficult for prostitutes to be prostitutes does not help the women and girls to stop being prostitutes. Forcing prostitutes to work alone forces prostitutes to put their lives in danger.
It is well documented that women working alone in prostitution are at a greater risk of being abused, seriously assulted and raped. If the law stops the women from protecting each other surely the law is morally culpable when the women are harmed.
Keeping the women safe allows the women to have greater control of their lives. Having greater control of their lives is the first step to helping them to help themselves.
Allow prostitutes to work together.