Is it possiable to take your child with you overseas( if you accepted this job?)
Im not sure what this job is, but if it paying 10x's more than your current salary, then maybe you could figure out a way to be able to bring your child, and make the situation work...( maybe hire a nanny or someone to help you with her, if you can not be around all the time..) because It would be the chance of a life time for the both of you.....and who know what the future holds after the 3 years...and your mom, ( i am sure she would want you to do what would make you happy, and you could always fly her out to visit you...or hey, she could move with you and your daughter... to help you out with her..and all 3 of you moving together is a better support system anyways)
again, im not sure what your job entails, but If you are going to be making 10x's more, then you will have more opportunities available to you to make it work ( able to afford your daughter and mother better) I say go for it( for you, your daughter and your mother:)