"She's got some bite wounds across her tummy and her legs, some of those have become infected as well".
Hana said: "It's obviously a hard situation with Covid but also with her being intubated and unresponsive at the moment".
All of a sudden, Melissa was dragged underwater by a 10-ft crocodile and her sister found her face-down on the surface several minutes later.
But the twins' father claims they were assured by their tour company that there were no crocodiles in the water.
But Melissa must overcome her physical injuries and both women will need time to deal with the emotional and mental fallout of what they have been through. Luckily, her super-badass twin sister was there to punch it repeatedly.
Georgia Laurie, 28, fended off the predator's repeated attacks in the dark while dragging unconscious Melissa out of the water in Mexico.
The sisters were among a group of 25 foreign tourists taken by the unlicensed and inexperienced guide to a part of the lagoon where crocodiles breed and raise their young on Sunday evening.
They had been travelling, volunteering and working in animal sanctuaries, their sister Hana told BBC Radio 1 Newsbeat.
However due to his ignorance of the lagoon, he took the women into a crocodile nesting area where the reptiles are fiercely protective of their eggs.
The lagoon is known for its stands of mangroves and for brackish waters that turn bioluminescent at some times of the year.
"Melissa is alive, but we don't know if her injuries are life-threatening or not", their mother told the outlet.
"She's still incubated, in a medically induced coma and she's now developed sepsis. She suffered lacerations, bite wounds too".
The German declined to comment when contacted by MailOnline today [Thursday].
Mellisa was spotted under the water by her sister but was unconscious.
Civil Protection officer Guillermo Silva told Mexico's ecosdelpacifico.com environmental news website: 'We were alerted to a report of a crocodile attack on some people.
Lalo took me to the site where the attack happened and explained that properly-trained boatmen like him are anxious that the irresponsible actions of a rogue guide could harm their business. "The crocodile came back about three times", Hana added.
'It is the rainy season and it makes it easier for crocodiles to nest. "Where the accident happened there is a probability of nesting crocodiles, and a female could have been defending her eggs", he said. "They're not federally-approved experts, they don't know this place".
He explained Georgia tried to bring Melissa back to their boat but the crocodile attacked again.