Maria Alejandra Gomez-Quiroz is being held in Texas' Dilley detention center.
A Salvadoran migrant who was in ICE custody died following a "medical emergency" over the weekend, federal officials said.
A Johns Hopkins University researcher, originally from Cameroon, was detained by Immigration and Customs Enforcement officers earlier this week.
Collins said all ICE agents will wear body cams nationwide by the end of August.
A federal judge has ordered the release of a witness to the fatal shooting of Lorenzo Salgado Araujo by federal immigration officers during a traffic stop in Houston.
Dozens of protesters gathered outside the North Carolina Legislative Building to protest Immigration and Customs Enforcement practices.