The Euxton athlete won an Olympic bronze medal in Tokyo last summer but took time over winter to take a break from the sport.
It was expected that the 30-year-old would have been training towards the World Indoor Championships in Belgrade in March where she would be one of the favourites to win a medal if not gold.
However, in a social media post, Bradshaw revealed she has been suffering from a mild bout of glandular fever and has decided to channel all her effort into getting ready for this summer's outdoor competitions.
Bradshaw is hoping to compete at a home Commonwealth Games in Birmingham and also has eyes on both the World and European Championships.
"Over the last 12 months I have been suffering from various health, body and mental challenges which have significantly affected my ability to train near the level I wish for," said Bradshaw.
"I am very aware that there is a big outdoor season on the horizon with three major championships so I'm channelling all of my energy into getting myself healthy for an incredibly exciting summer."
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