Stay far behind Betty Jetty so you can avoid multiple balls. After six or seven sets, you should be close enough to knock her down. (see related question)
When flying after Betty Jetty, you have to dodge 6 or 7 sets of glowing green balls (more if you get hit by any). Most sets contain 4 balls, but some only have one. Eventually you can close in and knock her down.
Depending on where she is when you start chasing her, about 6 or 7 sets of balls. Some sets have 4 balls and others have only 1 ball. Stay back and dodge, and eventually you will find that you can close in and knock her down. The total number of green balls to dodge is about 20.
You just have to dodge the green balls, and after awhile you can get close enough to run into her. After dodging about 3 or 4 sets of four balls, and 3 or 4 single balls, or about two minutes of flying, you can reach her.
Probably about 4 or 3.
A set of the green energy balls that she throws can be either 4 or just 1 ball. After 7 or 8 sets of balls (without getting hit), you will be able to knock her down. Until then, you can't catch her and so you should stay back and dodge the balls.
After about a minute or two of staying back and dodging the green energy balls, you will be able to get close enough to knock her down. You have to dodge 7 or 8 sets (each set is 1 or 4 balls) without getting hit.
When you are flying behind Betty Jetty, you can only get hit 4 times by the glowing green balls she throws. The fifth hit will knock you down and you have to start over. The balls are thrown in SETS of either 4 balls or 1 ball. You have to dodge six or seven SETS of the balls, which means flying behind her for about two minutes before you can swoop in and knock her down.
You should stay well away from her to give yourself time to dodge (hard to the right or hard to the left will usually avoid the energy balls). After 6 or 7 sets (either one or four balls) you can get close enough to knock her down.
Hide in the screen you'll win pinky promise
All you have to do is fly after her, and stay back far enough to dodge the green energy balls. Eventually, after six or seven sets of the balls, you can fly close enough to knock her down. This usually takes about 2 minutes of chasing her without getting hit.
Depending on where you first catch up to her, either 6 or 7 sets of balls. Each set will contain either 4 balls or 1 ball (which spins around more). If you stay back, you have a better chance to dodge them. If you get hit, the number of sets required will increase.
She flies away. Fly after her (not too close to begin with) and dodge the green energy balls she throws. After a couple of minutes, you can get close enough to knock her down. (see related question)