^At the time, a lot of top ladies only did a combo to avoid the Zayak rule and that lasted even post Y2K.
Yes. She was going to repeat the loop so had to combine one of them. The 3loop 2toe sequence she did was easier than a straight 3loop2toe so she went for the easier option. This is similar to her earlier senior years when she wouldn't go for a 3lutz2toe but a 3lutz turn 2toe instead because she wouldn't have enough flow on the lutz landing to directly tag on the 2toe.
She used to do the 2axel2toe as well as her 3rd combo in her earlier days but stopped once she started going for the 3toe3toe. The first 2axel in Salome could not end with a 2toe because of the choreographed landing, and the second one (if it happens, like at SA or Nationals) was also timed to the music and can't end with a 2toe. Since Taj Mahal, there wasn't even a place for a second 2axel - the thinking was probably that a second 2axel would not be necessary if there was a 3toe3toe; and if there wasn't, the spare spot should be a 3toe instead.
Come to think of it, she might not have been successful with 3/3s other than the 3toe3toe, but she did try a variety of triple combos in her career:
3toe2toe, 3toe2loop, 3toe3toe
3sal2toe (2004), 3sal3loop (2001 practice)
3loop FL 2toe, 3loop3loop (1998 practice)
3flip2toe (2003), 3flip2toe2loop (2005), 3flip3toe (2006 practice)
3lutz2toe, 3lutz2loop, 3lutz3toe (2006 practice), 3lutz3loop (2001 practice)