Freshman Direct Admits to CS are a small group in a relatively small department at Washington, which may help overcome issues related to the size of the university, and she will have world class CS facilities, resources and expertise available to her from the moment she arrives on campus.
I recently came across this quote from Prof. Ed Lazowska (Bill & Melinda Gates Chair) in a Quora article, “At the University of Washington we have two degree programs: a B.S. in Computer Science offered through the College of Arts & Sciences, and a B.S. in Computer Engineering offered through the College of Engineering. … It tends to be easier to dual-major from Computer Science, because there is heavy overlap in the distribution requirements with other A&S programs - we have lots of dual majors with music, art, math, biology, linguistics, [etc.].”
At a school like the UW, there are hundreds of majors, minors and concentrations available (and many departments besides CS are world class in their own right).
Are you instate at the UW?
Congratulations and good luck!