My mom is mean :(

So I'm pregnant n having lots of aches and pains and it's really hard for me to clean myhousen my house is small, so I asked her if I payed her 20$ can she help me wash dishes n mop n I would pay her Sunday when I have my gender reveal , well she told my sister she wants cash now so she can buy hair dye, n that's kind of messed up because I actually do need her help n she don't want to cuz I'm not give her the cash today