"I just played really solid the whole day," the 28-year-old told www.ladieseuropeantour.com. "I hit a lot of greens, hit a few close shots that I really capitalised on and sunk the putts.
"I chipped in out of the bunker on my eighth hole, which is 17, so just everything went well. I love Tenerife, I love Spain. I'm always very relaxed when I play in this part of the world."
England's Trish Johnson was alone in second place at five under after carding a 67 containing six birdies and one bogey.
Italian Veronica Zorzi, South African Lee-Anne Pace and Germany's Miriam Nagl carded four under par 68s to lie in a share of third place.
Zorzi, who is going for her first title since 2006, said: "I played good. I got one eagle, so that was great and I got some pars, two bogeys. I hit 12 fairways, so it's good."