No, if a life estate was reserved, then the property wasn't given to you in the sense that you "own" the property and you just have to let her live there. You are not a landlord. You have an interest in the property, that is certain, but the interest is a future interest, not a present interest. I realize that this stuff is kind of complicated, but really the only interest you have in the property right now is that the property must be returned to you someday -- when the life tenant dies -- in good condition.
Utilities would likely be the responsibility of the life tenant, whereas the insurance would likely be the repsonsibility of the remainderman (you), since it is their future interest that the insurance is protecting. However, this can be changed if the trust is specific on these points.
You might want to consider taking the trust documents down to a local attorney for review -- we can only opine based on what you have written, and attorney who has access to all of the facts might see something that changes this situation from that of a standard life estate problem.