I think it's probably a mistake to imply Selene previously lived a full life as this sets a level of expectation I'm unsure the author can fulfill. This is an adaptation so it's source should be a web novel. Generally this means they don't stray far from the source. Web novel writers have largely shown that they cannot convincing write a 20 year old, cannot convincingly write a 30 year old, cannot convincingly write a 40 year old, and cannot convincingly write a 50 year old. All end up being written as if they are 14. It is unlikely they can write someone that lived to an old age and died of natural causes.
That said this has a promising start with the disposition Selene has shown so far.