jogging/running slimming thighs?

I'm not sure if you are trying to "spot reduce", if so, no it wont help at all. Your calorie reporting is completely unknowable without accurate tracking, so you need to start there, you could be eating more/less than you think. Also what kind of weights and exercises were you doing that you thought you got bulkier thighs on?

If you do heavy lifts like leg presses and squats, yes just aerobic exercises do seem to slim somewhat in comparison to weight training on the thighs, but the difference is probably more "activated quads" or being "pumped" after heavy lifts in restricted muscle groups vs no "pump" and general entire leg muscles activated after running for most people. I do notice a difference in muscle when I focus on hiking over the summer (wider calves) vs lifting (more quad definition and post workout bulk), but, I'm a guy and most girls can't lift near as much, and just wont ever bulk up as much if they could. Even if there is some effect, its small, and you'd have to be doing weights you just cant push on 600 calories per day, you'd need almost all those calories for just that kind of workout, so I'd forget the weight training = bulking up my thighs worry.

Another thing, if you came from doing very little or nothing, you will gain some definition vs what you were doing before no matter what, and you may gain more awareness/feeling in your thighs after workouts (activated or sore muscles) which may make you feel like your pants are tighter for a few hours or days after, but that is not really bulking and if you measure your thighs 2 days after each workout vs your pre-workout state, you'll probably see a reduction in thigh circumference as you lose fat. Its good for you if this is the case, you could be gaining muscle and the ability to burn more calories/day.

Don't starve yourself - it slows your metabolism. If you're exercising regularly, 2000 calories is a healthy estimate for someone your size. I know because I'm 5'5'' and that is what I eat and also do regular exercise (30 min strength, 30 min cardio, swimming, biking places. 5-6 days a week).

To answer your question, running does not slim your thighs directly. If you burn enough calories from running, you will lose fat all over, but you will gain enough muscle in your legs to make up for the fat you lost. Assuming you're not grossly overweight of course. Running is great though because it gives you a butt to make any lady jealous

OP I have slimmed my thighs by running, but that's where I lose first. Please consider eating a more balanced diet for your overall health.