Am I being too sensitive? My mother in law will not say "Hi" or "bye" to me she will to kids & hubby

You should always be openly honest in my eyes as it causes problems like this, maybe if you just mention something it gets it off your chest? I guess it's kinda hard but the more you talk about these sort of things the easier they are to handle. Hope this helps :)

Do you say it to her? If she doesn't answer ask her why. If you don't ask her then you say it first.