"I met her in a shop."

Translation: Spotkałem ją w sklepie.

[lk1983pl]

poznałem ją w sklepie

[Jellei]

Different meaning, but a perfectly correct interpretation. Added now.

[HarveyPenf1]

why is się not needed here?

[gerard124456]

I am also curious about this. Do you say use się when you "we are meeting"? Whereas here it is "me meeting her"?

[Jellei]

Yes, that is correct :)