Should I (27) stick to her (33) and not let this break up happen?

My girlfriend/ fiancé has been in California with her son and her mom cause her son is dying and needs a stem cell transplant and a kidney transplant to which my girlfriend is donating to him. Her family treats her like Cinderella she always has to do everything stuff won’t be cleaned without her doing it her grown add brother can buy his own plan ticket to fly home and help her father. Her father relapsed on alcohol and it all falls on my girlfriend and it’s stressing her to death and cause hate and anger. So lately I’ve been feeling insecure about our relationship cause we barley talk anymore and I’ve been going to my cousin for help and I by mistake sent my girlfriend a message meant to my cousin and that mad her flip she said she’s tired of everybody’s bull crap and me adding to it which I’m trying not to hence why I’m going to my cousin for help. Well we talked on the phone later that night and she said I can’t deal with more kid shit and said she can’t pick and hold another person up like she feels she has to with me since I am being insecure I said let me fix it my issues are on me not you and I have been working on them with the gym and therapy long story short it sounded like she was mad and upset and it sounded like she almost broke up with me and us and I’m so nervous that she will I told her to let me prove my words with actions give me the chance to I asked if we were good she said we are fine which could be good or bad then she had to go deal with her son and she said bye and a low I love you and goodnight.
Should I take her I love you as what it is and she is sticking this through or should I expect a break up happening soon? Cause I don’t want to lose her help!!!

Should I (27) stick to her (33) and not let this break up happen?
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