Lifting won't make you bulky! You should lift. There's many of us ladies on this forum who lift and we'll be the first to tout the power of it
That said, I think it's important to get a mix of both cardio and heavy weight training if you can manage it. If you can't, go for the heavy weight training.
You should check out the weight training forum for some tips, but just know that weight training is VERY GOOD for women and will give you that "toned" look that you're after. We simply don't have the testosterone to build muscle the way guys do unless we really want to. You won't accidentally become a hulk, trust me
If you eat at a deficit while weight training you will continue to drop fat (you might see an initial gain on the scale, but it's water weight from your body going: OMGWTF at the sudden change in your exercise) and keep most of your muscle. So while in the end you might weigh a little more, but you'll look smaller.
People think I weigh about 90-95lbs most of the time