Yes, he wished it on the first shooting star card, that is why he ran screeming to Danny's room afterwards.
No, there was no "next" Danny and Walter. There was only one Danny, one Walter, one Lisa. Walter made the terrible wish, so Danny ceased to exist as if he had never been born. Walter then could not continue the game, so he stayed in it for the next fifteen years, during which time he learned all about the Zorgons and other things within the game, and eventually he learned about time travel. So, he travelled back in time to before he had wished Danny away. Thus he was able to meet himself from fifteen years earlier (and Danny, too). Whenever Walter (the one from 15 years earlier) was arguing with Danny, he acted as the peace keeper, so he (from 15 years earlier) would not come to the point of wishing Danny away.
It was the same Walter, not a next Walter; the same game, not a next game.
Now, as for the original question, what happened to Lisa. It did not matter what happened to her. Once Walter travelled back in time and prevented his younger self from wishing Danny away, the game was back on track, so it made no difference what happened to Lisa in the original time line.
The only reason we meet the other Danny is that Walter, unaware that the astronaut was himself, wished for the astronaut's brother to come back. It was not necessary from the time travel perspective, it only happened because he wished it (and because the story tellers needed an excuse to explain that the astronaut was Walter).
The only thing that mattered was that Walter found a way to finish the game (by travelling back in time and making peace between his younger self and Danny). After the game is over, it resets itself, so everything is back to normal, the house is back to normal, the gerbil is back to normal, Danny is back to normal, Walter is back to normal (except he stops being nasty to Danny), and Lisa is back to normal. Well, everything except the bike, but that's really just a joke so there is no doubt that it all did actually happen despite them pretending that it never happened.
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