Mrs Jackson worked in education for three decades, dedicating more than half of that at Penkford.
She died just days after Penkford was forced to close due to a number of Covid outbreaks.
The school announced Mrs Jackson’s death in a message posted on its website on Tuesday evening.
Star readers, including former colleague's of Mrs Jackson posted their tributes to her on the Star's social media pages.
Fiona Alexandra Maxwell said: "It is a privilege to call you my friend and my colleague. Rest easy Janet. We will miss you more than words can say. Love to your beautiful family"