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Hello and thank you for your question. It would be impossible to provide an official diagnosis for your mother without a face to face evaluation, but based on what you are describing in terms of her behavior, it does seem like there is a high probability she suffers from traits of Narcissistic Personality Disorder (NPD). Your mother appeared selfish, lacked empathy, controlling, and failed to take responsibility for her own actions which are all symptoms of NPD. You did not mention much in terms of grandiosity, but I imagine she may have had those symptoms as well given some of your description. Individuals with NPD rarely think anything is wrong with them and instead feel that everyone else is wrong, so there is a strong lack of insight with this disorder. Because you have good insight and you have a strong sense of connection/empathy to others there is a very low likelihood you would suffer from NPD.
I hope this answers your question and gives you some guidance on this issue. Please let me know if you have any questions or concerns as I am happy to assist and support you regarding this issue.
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I am sorry that you do not have a relationship with your siblings, nor your mother. I can understand how difficult that must be for you. It is possible that some of your siblings may have some NPD traits as there is a strong genetic component to this disorder, but of course many adult siblings do not get a long for a host of different reasons as well.
Well you asked a simple question on if your mother could be a narcissist, which I answered. I would be happy to provide more details on this if you like, so please ask me more question specific on this issue that you would like answers on as I would be happy to provide more assistance.
No problem, you are more than welcome to do that. Good luck to you finding the answer you are looking for :)