Hi, no worries about the questions. Glad to be of service.
I measured a size 150 L032 exact piece and waist is 62cm. So really can't fit. And also due to the polyester material, I don't think alteration can be done, especially since need to increase another 2-3cm :( Sorry about that.
26 inches = 66cm
CG0925 Size 150 is 70cm waist and 88cm length. This is the most suitable one.
I just measured P30762 size 150 and waist can only almost stretch up to 66cm. Might be tad uncomfortable for her.
P31032 size 150 can also stretch up to 66cm.
Best fit is C0925 size 150 followed by P31032 although scared abit tight. P30762 is better not to take.
Hope above helps. Let us know if you have any further queries. Thanks!