Welcome to the forum. Glad that you have moved out of the lurker shadows.
Your goal is sensible and realistic. It puts you just above the average in the healthy range which is a great place to be. You have done well to lose 11kg in just over 9 weeks.
It is more than likely this plateau that you are hitting is just your body getting a well deserved breather before allowing you to lose more weight. It is hard for us to accept slow down periods but they are just an essential part of the process. Your body is making important adjustments. This spells out nothing but good things for you in the future. Think of it like running up a hill. Once you get to the peak you'll be flying down the other side with little effort!
Your food plan sounds good to me. You are learning about portion control. Curbed your fizzy drink intake. Giving yourself treats in a controlled real world way. The good thing about lite n easy is that it teaches you what "normal" looks like on a plate.
You might want to start thinking about turning your walk into a jog (just a fancy way of saying a faster walk with a shuffle). As you develop your fitness always try it push the boundaries of what you can do a little further. Being comfortable is not where you want to be (but do no harm!).
My daughter has a touch of autism. We put her in a small private school which is very caring on the advice of her public school kindie teacher, who thought that the rough and tumble of public school may put her to disadvantage. She was right. Our daughter is doing very well now. Her socialization is steadily improving through the efforts of some excellent teachers over the years. Autism can be frustrating but at other times it is very interesting. My daughter knows the car rego numbers of most of our friends. We hit a shopping centre she is able to spot their number plate and lets us know who is at the shopping centre! Tonight on our walk she was able to recite the list of songs on her One Direction, Abba and Simon & Garfunkel CD's...in order.
Use this forum. Ask questions, get encouragement and use it as a tool for success.
Wishing the best for your future.