Quite an interesting looking bird. Are you sure she's a she? That second picture, the feathering looks rather manly. Can you get a better picture of the tail region? I think I see saddles. Either way, an pretty bird for sure. I'd never heard of the breed.
At 7 months old with no crowing, I'm thinking hen. The feathers are throwing me off as well, but I think it may just be the breed? Here's a picture that shows her tail a little better, and you're right, there are saddle feathers.
I had one who was for sure a roo, and he was quite a bit larger with a bigger comb and longer feathers. I no longer have him, but I do have pictures comparing the two when they were younger.
3-4 months old. Roo on the right.
Honestly I'm not bothered at all if she turns out to be a rooster. I bought pullets, but you know how it goes. Madagascars aren't exactly known for being good layers, and considering she's only housed with hens, it's no problem.