I may be following older tactics used by keepers a decade ago where higher basking temps that reach 90 degrees even for an adult male veiled are good, but nonetheless, the most important thing is that you create a habitat she can thermoregulate. Doesn't matter too much what the basking spot temp is, just as long as it isn't hot enough to burn her of course (place your hand underneath the basking bulb where the basking spot is and see if the light is concentrated too close to that spot by seeing if you're able to hold your hand there comfortably w/o the top of your hand/skin getting cooked).