OOT: It’s brought down in some Poskim that the reason boys don’t send Shalach Manos to girls is because there is a Chashash Kiddushin. That might still apply in many communities today but there are also plenty of places where it would be normal for boys to send girls gifts and therefore there is no Chashash Kiddushin.
Her Rabbonim could have told her to explicitly state before taking any of the Shalach Manos that she is not accepting Kiddushin by taking these. That would also work.