She only might but chances for her to do it is very small because she loves you foe sure and will not do such crazy thing to harm you. Well, unless you're aware that you married a psychopath gold digger .

Don't be so self-centered mate, your family is your last resort when you die. You can entrust all of your btc savings to them before you die but make sure you teach them first about this technology or at least find someone who is really willing to learn. You know what, you are lucky if you have a family because people who don't have are absolutely dying for it. Actually, if I die right now I would love to give all of my btc to my family but since my mother deceased already, my father got a new family and my siblings are too young for this matter then probably I let my girlfriend handle it for the meantime.
Wise choice, don't worry too much because everyone is interested when it comes to money lol.