It could take up to a week for her to get used to it. Heat is what entices them to bask, if they get on the ramp, but don't feel any heat, theres no point in going up. To speed things up, you could put the heat lamp closer to the ramp, and as soon as you see her basking, slowly move it back to where you want her to bask(over the course of 4 to 6 days) and she should fellow the heat.
Good luck, and let us know how things work out!
Nathan.
EDIT: Oh yeah I forgot, if you want to see what she is doing at work, you could set-up a web-cam! I know of a few people on this forum that have done this.

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RES's
Tank, SCL 3.75in.
Diesel, SCL 3in.