What is the life spaan for a pom-chi and when should I stop trying to breed her? At what age? Is it safe to breed her with a wee

As a general rule, the smaller breeds live longer than larger breeds.  There are exceptions to this rule, but your pom-chi mix should be able to make it to 15 years unless some health problem intervenes.

As for allowing her to breed, you should consider stopping that by the time she is 7-8 years old.  I couldn't answer the rest of your question because it got cut off.

Helpful Buckeye