As dropthezero stated it, people in Argentina find it cute when
someone speaks with accent. When I was a child there were many older
people who still spoke with a very strong accent (many were second
generation of inmigrants in Argentina). We were used to it and found it
great that those people could actually speak another language! (At that
time English was not usually taught at school).You said that
your friend speaks Spanish well...but are you sure she didn't say
anything funny? (by mistake I mean...like using some word or expression
that in Argentina has a completely different meaning...or just another
meaning) The slang is monstrous in BA...even for Argentineans!