By the way, in US this would called "rock climbing" even if the surface to be climbed was an artificial one. If it was indoors on an artificial surface, it would still be "indoor rock climbing." I had to search to find the meaning of "abseiling" as I had never heard the term before.

Which is true? Not “what” is true.

My sister likes abseiling. Or even, my sister likes to go abseiling

2) is right.

Hi Marina You could say: My sister enjoys abseiling.