Hi, Rose !
We can't spot reduce areas of our bodies we don't like. It would be nice if we could, but we can't. However, if you continue to eat right, watch your portions and get some regular exercise that includes some strength training, you will eventually lose weight off your arms. You don't get to decide where the weight comes off. Genetics makes that decision. So, don't beat yourself up because your arms don't seem to be losing as quick as the rest of your body. With time, you will lose off your entire body.
For now, you definitely want to engage in some regular strength training. Don't be afraid to lift a heavy weight. You will not look like a body builder if you do. Women don't pack on muscle the same way men do because we lack the necessary testosterone. So, don't be afraid to use a heavy weight. If you want to see results, you need to challenge your body.
Also, when you strength train, you don't want to focus just on your arms. Work your entire body because it is one whole package, not parts. You want the whole thing to look good, right ? Okay, thus the need to do some strength training that works your whole body and not just your arms.
Try some of Coach Nicole's 10-15 minute strength workouts. You might want to join SERGEANTMAJORs resistance band team. If you don't want use weights, you could strength train using resistance bands and body weight exercises. He has a bunch of beginner to advanced level workouts posted. www.sparkpeople.com/myspark/groups_individ
Be patient with yourself and your body. Change really does take time.