Healey was born in Salford, Greater Manchester, to a father of West Indian descent and an English mother. Her small-screen debut was in the recurring role of Katie Moore in BBC Three's twenty-something drama Burn It in 2003.
Healey played pupil Janeece Bryant from 2006 to 2009 on the BBC drama series Waterloo Road. After departing at the end of the programme's 4th series in May 2009, she reprised the role for its 6th series as the new school secretary, broadcast in 2010. She also is among the cast members confirmed to return for the 7th series of Waterloo Road (2011-2012).
Healey has also made guest appearances in the crime drama Conviction; the situation comedy Two Pints of Lager and a Packet of Crisps; daytime medical soap opera Doctors all for the BBC — and Channel 4's teen soap Hollyoaks. She appeared in Two Pints… as a member of the 'Chavettes', which Louise had to monitor for her community service; in Hollyoaks she played Michelle, Danny Valentine's ex-girlfriend/fiancee. She has played two different characters in Doctors — Ilsa Marsh in the episode "Overdue" (2004); and Louise Calvert in "Next Door to Alice" (2007). She also had an appearance in Young Dracula as a reporter in 2011.
Healey took part in the ninth series of Strictly Come Dancing. She was partnered with dancer and newcomer to the series Pasha Kovalev. Healey became the first contestant in series 9 to earn a perfect 40 out of 40 for her paso doble, in week 11 of the competition. She finished the series as runner-up.