Victoria doesn't need to get to 0 speed. She is like a water only using buffs and need over 60 speed. Better to be over 100 speed in order to properly burst and move before the attackers without ruining their combo. She is not an attacker so she doesn't need 0 speed.

There are ways to lvl without burst. Bursting hasn't been round since version 3 so before that people had to lvl as well and there were people in Aries who were lvl 140+ by the time bursting came out. So don't just rely on bursting. Even after you burst and rebirth you need to go back to lvling the long way since you cannot burst after 180 or after rebirth.

lvl 1 go to ore cave
lvl 8 go to chickens
lvl 12 go to beetles
lvl 18 go to cirrus
lvl 43 go to raptors
etc etc etc... just learn to use search. Lots of people have written guides on how to advance and where to go next to get higher lvls.

even just acting like a water and doing debuff training is fine; example have the fastest person use a debuff skill then the rest of the team attacks. for example have water use freeze then and everyone attack. or have earth use treebine and everyone attack. or if its a bet like shasha use have her speed faster than the team then have her use freeze everyone attacks. I think it should work the same way for Victoria. have her use Fiery attack on the player who is her companion and then have them as well as the rest of the team attack. just set mote like that. everyone pokes. the de buffer has the skill set to priority or round one "use skill on so and so" and rinse repeat.

to start with here is some;
http://wlodb.com/topics/4645 = guide shows how to lvl from 1 - 75+
http://wlodb.com/topics/13527 = guide shows how to lvl from 1 - 150+
http://wlodb.com/topics/7671 = guide shows how to scroll your pet to have good stats to make lvling better and easier for them and you.