I can see that more from Rachel than from Grace. If Danny told Grace the truth about having to stay in Hawaii because Uncle Steve was in big trouble and needed his help, I'm sure Grace would have understood. And then Rachel and Grace came back to Hawaii pretty quickly, so it's not like they were separated for months. There wasn't really much time for resentment to build.

What I worry about is that the more time Grace spends with the mansion and country club set, the less she'll want to visit Danny, not because she doesn't want to spend time with him, but because she hates the crappy places he lives. Who would want to go from mansions and servants to black mold and no windows?