I feel like she's doing the right thing by encouraging him to go if he's so affected by it. Even if she does learn English, how long would it take for her to get good enough to work in the US anyway. She could work really hard obviously, but I think even if she's hard-working, she's lacking in...
I tried to support and buy the e-book version of her manga on ebookjapan but Yahoo isn't allowing account registration without a Japanese phone number until mid-June 😢