You do not necessarily need to be good at freehand drawing to be an architectural engineer because most drawings are now done on the computer (CADD). It may help to be able to draw a sketch freehand, but this is not a requirement. This job is no harder for girls than for guys! Whether you are an architect, an architectural engineer, or a civil engineer, you will need to go on site occasionally, but the majority of your work is in the office.
Hope this helps,