The injured woman was cared for on Wednesday in the intensive care unit in Kalmar, but left IVA on Thursday, according to Region Kalmar.
She has also already been heard by police.
- She was a customer in the store and was at the checkout.
But we can not say more of what she said as it is an important part of our preliminary investigation, says police spokesman Robert Loeffel, spokesman for the Police Region South.
The suspect is said to have beaten a teenage boy
The arrested woman, who is in her 30s, is also suspected of assaulting another customer in the store, an 18-year-old boy who was beaten by the woman.
Initially, the woman is suspected of aggravated assault in that case.
- It's a boy as a kind of woman's shelter.
He has only received pain from the assault, no wounds, says Robert Loeffel.
Not clear if they knew each other
The stabbing or cutting weapon used in the act has been seized by the police, the police can not comment on any further details, but according to witnesses that SVT spoke to, it is a type of machete, or larger knife.
There are several witnesses to the incident.
Do women already know each other?
- We have to talk to the suspect first to be able to arrive at what is behind this, Robert Loeffel concludes.
The woman is currently suspected of attempted murder, but as the incident is investigated, more headings may be added and changed.