All perfect praise be to Allaah, The Lord of the Worlds. I testify that there is none worthy of worship except Allaah, and that Muhammad is His slave and Messenger.
It is permissible for a Muslim woman to work in the market, to buy and sell, but she is obliged to abide by the religious obligations among which is wearing Hijab, being modest, having a good moral conduct when talking to man, and the like. Indeed, we have already issued Fatwa 82399 clarifying the pre-conditions for a woman to work, so please refer to it.
Therefore, it is permissible for you to use some pious women to work in your shop, and if it is in a public place in a way that people may see them, then this is not a prohibited seclusion. Nonetheless, if there is another woman with her, then this is better in order to avoid any suspicion.
Furthermore, you are not obliged to bring your wife when you want to go to the shop to check the work, but if you do so, then this is better and safer.
Allaah Knows best.