usually for tag questions, if the first sentence is positive (has, is, does), the second sentence including the tag question would be negative to balance out for example 1. Lisa has been able to play the flute since she was six, _ _ _? so the answer would be 'hasn't she' 2. She is the leader of the group, isn't she? 3. Juan does all the work by himself, doesn't he? I hope this will help you. Your second sentence is perfect:)

If you use "had or have" the tag is "hasn't she or hadn't she" - if you use "was or were" the tag is "wasn't she or weren't she" Example: "Lisa was playing in the park, wasn't she?" / "Lisa had been playing in the park, hadn't she?" / "Lisa has played in the park, hasn't she?"/ "you were playing in the park, weren't you?"

The correct tag question is “…, hasn’t she?” This is because the sentence is written in the present perfect tense (“has been able to”) not the simple past (“was able to,” which would then require the tag question “wasn’t she?”). Your second sentence is perfect.