There’s something confused and confusing about the terms you’re using—and while words can sometimes just be words, they most often have loaded meanings in the legal world.
For example, securing
a legal guardianship or conservatorship would have required a fairly involved court procedure in which a court would have to hear evidence about why it was necessary, whether it was in your mother’s best interests and whether and why you were a good person for the job.
Your mom and an attorney could not have accomplished this on their own; the judge in a probate court would have to sign off on it—and when that happened, you would be given a sheaf of legal papers that fairly specifically spell out your duties. Some guardians, for example, are empowered only to handle finances for another person; some are given responsibility for their personal care.
If you have the legal documents, check them closely; they should spell out your duties. If you were not issued the papers specifically naming you as a guardian or conservator, you may not be one; check with the local probate court to be sure.
If the whole situation still seems confused and confusing on your end, check with the attorney who was involved in the procedure; he or she should be able to explain who is now legally responsible for what.