Find another math class to continue. Don't let her math skills regress for a year. Start learning to code now if you don't know so already. However, don't take your school's AP Computer Science. It's a joke and no one uses Java anymore. Instead, start learning Python or C#. Coding is a part of the engineering curriculum.

Have her get involved in activity related to engineering such as robotics, habit for humanity (ability to build with your hands is appreciated), etc.

Intern or shadow an engineer firm some during the summer. Learn about the profession and understand what a day's worth of work looks like.

Lastly, get the ACT math score up to at least a 30. So if that means taking it again, then do it.

Doing all this combined with a solid class ranking and GPA should get you into the COE.