Don't be angry or sad! Just tell your matchmaker (or let your mother-in-law tell her) that she's going to miss a great opportunity to earn a lot of money from your red envelope! Let her kind of feel sorry...and then, I guess she'll be back--if you can't replace this matchmaker.
Unfortunately, I had this problem as well, but my in-law just told her in the same way I told you, so she couldn't turn it down in front of my in-law (my mother-in-law asked my husband's aunt to be our matchmaker). You got that? Let the parents solve the problem instead of facing with it on your own. Cheer up and you'll know what to do!! Good luck! : )