That is a very tough decision as she is tiny. I have a 3 pounder and had her spayed. My thought here is a lot of people do it when their girls are still pups and thus would be roughly around the size your girl is. In general it is pretty safe, although occassionally things can go wrong.
Hopefully you will get more responses (probably in the am as it is kind of late now) that will help you make this decision.
Good luck!
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