Aisling Brady-McCarthy has said she is "overwhelmed", after murder charges against her were dropped.

The 37-year-old Cavan woman was released from custody in Boston earlier this week, and arrived home to Shannon Airport this morning.

She landed back at 6.15am on an Aer Lingus flight from Boston, and was surrounded by police as she came through arrivals.

She told reporters she is glad to be home, and then started crying as she left the airport.

But speaking to the Boston Herald before she left the US, she said: "I am overwhelmed...It has been crazy and hectic".

The charges against Ms Brady McCarthy were dropped after the medical examiner in the case changed it is ruling to an undetermined cause of death, rather than homicide.

One-year-old Rehma Sabir was found unresponsive at her Massachusetts home in January 2013, while in the care of Ms Brady-McCarthy.

"What the Middlesex prosecutors did to me was scandalous," she said, adding that "They should be ashamed of themselves".

She claims the police "decided right away that I had killed the child. That couldn't be further from the truth".

"They were wrong...but it seemed that except for my family and my lawyers, Melinda (Thompson) and David Meier, God bless them, no one would listen".

She also says that she got support from other parents who had employed her as a nanny, and that they would visit her "every week".

The defence for Ms Brady McCarthy said she had been jailed for 2½ years for a crime that never occurred.