Like 30 years from her being 28(2017), the grand war takes place.

She is on the battlefield to defend Equestria against whatever oppose them. Her mane gets cut and her face gear gets destroyed, so her face is full of blood and scars afterwards.

She ends up succesful in defending Equestria, only losing some royal guards. She sooner ends up making a spell which results in her becomming an alicorn.

Her duty is to keep order in Equestria and beyond. So she is now the princess of order, her front mane grews back out, while she keeps her back mane cut since she actually liked it that way. Her wings also get's red because of the marks in her face, like they transfer onto the wings somehow.