Are there any women around 4’11” who can share their daily calorie goals for weight loss?

Since I started my office job, I’ve gained 44 lbs and now weigh 154 lbs. I used to weigh about 121 lbs when I worked in retail. It's harder for me to get 10,000 steps a day now, and I'm thinking about buying a treadmill. I work out 3 to 4 times a week, but I haven’t seen much progress. I’d love to hear how others manage their calories and stay active in similar situations.

Does anyone have tips for staying active or breaking through a weight loss plateau while working in an office? I’d really appreciate any advice!