I have a feeling that she's going to regret this later, probably in both ways.
Backfire number 1: Ningguang is going to hire Shenhe to make sure Yelan is working. Backfire number 2: Shenhe is going to interpret it as being payed to look after Yelan, preventing Yelan from working even more.
Knowing everyone's luck, there's a third unintended consequence as well.