Tell her to keep a very close eye on her neck and her tongue. Hopefully she won't need to worry but knowing what's normal in her mouth and neck once she is healed is important to detecting a possible recurrence. Believe me when I tell you I am not a negative person, but sometimes if they skip rads and chemo node or something odd will pop up. This is usually less likely if she's had a neck dissection, but it's a better safe than sorry mentality. hugs and just give her time.