Diet-
Well I am not a supporter of atikns, if you so desire I can show you numerous studies that give support to its lack of benefits and unfun side effects that occur with using that diet. On top of that contrary to what most believe now carbs are just as important to muscle gain and weight loss as protein. Denying your self of good fiber and complex carbs could be the key to your hindered results, at the same time since you have been doing it so long i do recommend if you take my advice on upping your carb intake

then you should introduce them back into your system slowy as to afford any weight gain from depriving yourself of them. If you just don't like those items (bread, pasta so forth) then might i recommend beans, oatmeal, sweet potatos. Great complex carbs. I can show you articles on women/men who stalled on atikins/low carb diet, re-introduced carbs into their system and saw great results. I just don't want to get to technical here yet.
Strength Training-
The 100 number just isn't the way to go for strength training. Being your goal is weight loss just a simple 3 day a week full body strength train is all you need. 3 sets of 12 reps. Try to get in good compound movements (squats, deadlifts, rows) mixed with a couple of isolates (crunch, bicep curls, leg curls)
Your routine should take about 40 to 50 mins. Doing 100 crunches in a row is just going to overtrain your muscles and give you no effect. However doing 20
in sets of 3 with focused effort can do wonders. So get a good full body routine or if you need help with one let us know.
Cardio-Seems to be fine really, you might want to increase your time a little more so then intensity. As far as the running though this may seem obvious I just want to stress how important a good shoe is when running. Don't skimp on the shoes, and if running outside alot try and run of dirt tracks or grass more than concreate if you can.