First, keep the
resistance training in your routine, too many women neglect that. Thankfully most of the women of DF even do deadlifts and squats. And as a result are some of the physically finest and fittest looking ladies you'll ever see. More muscle requires more calories to support, won't give you arnolditis, and help give you the "toned" look that women strive for.
Full body
weight workouts 3 times a week is a good place to start. Something like weights you can handle for 8 reps, when you can do 12 increase the weight.
About the cardio, walking is great. But if you've acclimated to it and aren't responding any more you need to change something. Perhaps up the intensity by moderate running, or even go all out and do a HIIT routine. Running and walking mixed in the same routine. If you are giving good intensity in HIIT, you probably won't make it past 15 minutes. The benefit of this is a metabolic boost that burns fat all day instead of relying on direct fat burning while exercising. The other benefit is that you won't accidentally go for too long and end up catabolizing muscle tissue for energy.
Another way to change it is do do direct fat burning. Simply do your walking immediately upon waking before breakfast, while your glycogen stores are at their lowest. This is very effective if you don't take the intensity too high, and again cut into your muscle for energy.
Diet: You didn't really share your nutrition plan so it is difficult to directly address this. I'm probably the biggest proponent of the high fat/low carb approach to nutrition for bulking and cutting but at 5'0" and 105lbs it doesn't sound as if you really need something like this.
Just remember that if you aren't eating enough, your body will sacrifice muscle in order to save fat which it views as vital to survival because it thinks you are starving. This makes that last bit of tummy nearly impossible to starve off.
If you are eating too much, you are simply maintaining or building muscle and not burning off that last bit of fat.
Plus, we don't know how big you were when you started. History of having children? Some of it may be skin that only looks like fat. I have a bit of that left over on my transverse abdomen and obliques from when I was a 300lb tub of lard. I use lighting, tanning, and positioning to hide it for photos.
Read this, reread your initial post, and if there is anything more specific you need simply ask. Someone will help you. Some good folks here who helped me a great deal in my quest for fitness. They will certainly help you too.
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