There are two things I don't understand

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Aug 11th 2012 18:30
There are two things I don't understand.
http://www.esl-lab.com/car-accident/car-accidentfra.htm

1. Daughter: It wasn't that at all. Don't (3) jam to conclusions.
What does "jam to conclusions" mean?

2. Man: Ask me after she returns from the trip.
I can understand this line means.
But I cannot understand contextual meaning.
Why did he say that and mean?
2か所わからないところがあります
http://www.esl-lab.com/car-accident/car-accidentfra.htm

1. Daughter: It wasn't that at all. Don't (3) jam to conclusions.
この"jam to conclusions"はどういう意味?

2. Man: Ask me after she returns from the trip.
この意味はわかるけど、
なんでここでこういうのかがよくわからん
なんで?どういう意味?