Okay,this is messed up.
Even if you are a troll,im going to answer cause someother legit person may need help and find it within me post.
There is no way that im aware of that will abort a litter and keep doggie intact.you either spay and maybe save her life,or you risk her life for a few cute puppies.
Notice I said few.Chihuahua's only have about 2 or 3 puppies each litter,and 1 may be stillborn,leaving you with just two puppies,still very weak and prone to infection and deasease.
Also,this litter will be bigger than the mother,due to the fathers size.This could kill her,leaving you with a dead bitch,and no puppies.
And dyo really think a weak,crossbred litter will be easy to sell?
You must b prepared to take back a unsocialized,untrained puppy when the new owner doesn't want them cause they got too much to handle.
I understand sometimes these things happen,i mean,i was in the same boat meself,but i chose to save my very young bitch from having a litter that could kill her.I spayed.
I just hope you do the same.