Absolutely not! I hate to hear about people breeding when they shouldn't be. Your friend is being terribly irresponsible. I would mention to her that her pet store chins could be carriers for any number of negative traits, like heart murmurs or malocclusion. If those traits are passed to the kits she will have some very sick, very miserable animals. If she cares about them, she won't take that risk.
You might also mention that breeding chinchillas in small numbers never yields a profit. I consider myself very lucky if I break even each month. It is only profitable when done in LARGE numbers, several hundred or more. So, she is actually probably going to lose money.
You should also tell her about what things can go wrong and the possible consequences. Is she prepared for a $1200 vet bill, if her female needs a c-section or an emergency spay? Is she prepared to feed kits every two hours round the clock for weeks at a time if her female dies or is unable to nurse her kits? These things are rare but they do happen. And no one should be breeding if they are unable to take on those situations.