Scaling the pattern up to fit your daughter might be tough if you've never done anything like that before. If the increase could be made by adjusting the seam allowance a little, then I may suggest you go ahead. But since your daughter would require the addition of 2" to fit her chest measurement, other areas such as the arm holes, shoulder and chest cross may get wonky.
Have you looked at Burda patterns? I think I've seen larger kid sizes for dresses with this similar style. You may find one that you both like!
Thank you. Even when I said it I knew I wouldn't try scaling it. My sewing time is so limited lately, so I need to focus on reliable sewing and not something that would take at least one muslin (probably more) before I could get to the real thing.
I'm just a little disappointed and frustrated, but I know pattern companies, even tiny independent ones like The Handmade Dress, can't take my above-the-99th-percentile tall children into consideration. It's not such a big deal with my boys, because there isn't a huge difference between boys and mens clothing styles and fits. However, there is a huge difference between girls and womens clothing, and having an 11 year old that is is a women's medium but still has a box-y little girl figure is a pain. Things that fit her waist bag on her hips and chest, and she desires to wear young girl type prints and styles that just aren't available in womens sizes.
Patterns aren't much better than ready-to-wear, since I either have to scale up little girl patterns or I have to make adjustments for her small bust or large waist (when compared to her hips). I do have a stack of Ottobre magazines, and she has 3 sizes to go before she outgrows their girl sizes, but they sadly do very few bigger girl dresses and those they do do are more fancy. She likes dresses, but prefers more casual ones. Still, it is a good reminder to go pull out my Ottobre and sew something for her.