A 13-YEAR-old girl has died just days after her seven-year-old brother – after the pair both ate chocolate Easter eggs suspected to have been poisoned.

Jordélia Pereira Barbosa, 35, was arrested in Brazil on suspicion of murder after officials claimed she spiked the chocolate in an act motivated by “revenge and jealousy”.

The eggs were delivered last Wednesday to her ex-boyfriend’s new partner, Mirian Lira, who shared them out with her kids.

Mirian’s son, Luis Fernando Rocha Silva reportedly fell ill immediately after eating the chocolate – prompting his mum to rush them to the Imperatriz City Hospital.

Tragically, the boy could not be saved and died in the early hours last Thursday.

Mirian, 32, and her thirteen-year-old daughter Evelyn also became sick and were rushed to hospital.

Evelyn died on Monday at Brazil’s Imperatriz Municipal Hospital, CNN Brasil reports.

The facility said Evlyn’s death was caused by a vascular shock linked to organ failure.

“Unfortunately, the clinical condition showed serious and rapid deterioration without responding to treatment,” Imperatriz Municipal Hospital said in a statement.

A motorbike courier reportedly turned up with the tainted treats along with a note reading: “With love, to Mirian Lira. Happy Easter.”

And Evlyn’s mum Mirian reportedly received an anonymous call after the delivery asking if the package had arrived.

Samples of the chocolate have been sent off for forensic analysis to confirm whether it is toxic.

Cops arrested Jordélia as she took a bus to her home town Santa Ines after staying in a hotel 200 miles away in Imperatiz, where the victims’ family lives.

Police reportedly found receipts and spoke to Jordélia’s ex-partner, which led them to believe she could be involved.

Cops also shared CCTV footage they said showed Jordélia buying Easter eggs while disguised in a black wig and dark sunglasses.

She can be seen holding the box of luxury eggs in the footage and rummaging through her bag to find a card.

Jordélia reportedly confessed to buying the chocolate in a statement at the Santa Inês Regional Police Station, but denied loading it with poison.

According to the Court of Justice of Maranhão, the case must be forwarded to the Criminal Court of Imperatriz, where the events took place.