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Are you doing conformation with her? If not she should get spayed, it's healthier for her and then the world doesn't end up with more dogs and puppies being euthanized.
I've seen boxers go into heat anywhere from 4 months to 24 months.
I rescued a female whom the vet told me she thought was spayed, then she went into heat in June. I don't know her exact age, but she was around 18 months old.
If you got her from a reputable breeder, they might be able to tell you when this particular mother's pups have tended to go into heat, but that's not a gaurantee either.
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