O built her 8 different times and she dies extremely fast her health and channeling does not fit her in school spell cost there is no real way to protect her
She effectively has built-in Regenerate 1, doesn't have a triple-cost school, and has cheap access to Water spells (which is one of the reasons the Wizard was nerfed)... So the question is whether or not that's enough to overcome the disadvantages of 30 life and 9 channeling.
She's definitely going to want lots of cheap Armor to protect that low life total, and Veteran's Belt might be a good way to go given she doesn't need Regrowth Belt / Wychwood Ironvine. And/or she wants to be very strong at controlling the board, which she's pretty good at (although arguably not quite as good as the Druid).
So far, in matches with/against her, the MVP's have been Sherean Leviathan (if legal), Water Elemental, Kraken, roughly in that order. So, yeah, big scary threats/protectors, rather than swarms of deptonnes or merrens or pirates. Not that deptonnes/merrens/pirates are inherently bad or can't win, but rather that she seems to generally need at least one of the 20+ mana creatures to protect her. Oh, and Naiya for action advantage and effectively +2 channeling most of the time. Naiya usually attracts a lot of attention, which also takes the heat off the Siren herself.