In the same episode, during the hangout with Quinn, she offered the MC a free ride with any girls he wants. If the MC picks her, she replies that's not what she meant and that he doesn't have to pay her for that. So despite having money issues she offered him a free ride and assures him he won't have to pay her for sex anymore. Which is a loss of money for her. On one hand, she offers MC free sex with her and other girls, on the other hand she charges Tommy the double for drugs. So if you can't see there is a significant difference of treatment, there's nothing I can do