Pregnancy in minitur pincher/corgey with a brown lab

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i am asking this for a relative, but she has a small miniture pincher/corgey dog that stays in the yard with the invisible fence. while she was camping this weekend, a brown lab came into the yard and mounted her. she never had blood yet, and today she is bleeding like haveing a period and she is all swollen. she will be a year old in december. could she be pregnant after this one time? is it going to be dangerous for her to give birth to a larger dogs babies? the husband was home with the dog while she was camping, and he didn't see the other dog come into the yard until it was too late.