Are cold sores cold sores contagious?

my friend touched her cold sore then held my hand D= i've had a cold sore before and it was horrible. i've been using hand sanitizer all day but then she touched me again and i forgot to use it then i had lunch D= will i catch it??? if so, how can i prevent it for appearing???
Update: From* sorry
Update 2: Oh and she's had it for 5 days now
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