Hi Chris,
Whitney was an amazing singer IMO. I did not buy any of her music and as she declined, I felt terrible for what she went through after having such an amazing career. Here are some stats: (remember 170 million albums!)
This article is about the person. For her 1985 eponymous album, see
Whitney Houston (album).

Whitney Houston

Whitney Houston performing at
Good Morning America in
Central Park on September 1, 2009 Background information Birth name Whitney Elizabeth Houston Born August 9, 1963(1963-08-09)
Newark, New Jersey, U.S. Died February 11, 2012(2012-02-11) (aged 48)
Beverly Hills, California, U.S.
Genres R&B,
soul,
pop,
dance,
gospel Occupations Singer, actress, model, film producer, record producer, songwriter Instruments Vocals, piano Years active 1977–2012
Labels Arista,
RCA Associated acts
Cissy Houston,
Dionne Warwick,
Dee Dee Warwick,
Aretha Franklin,
Jermaine Jackson,
Mariah Carey,
Enrique Iglesias,
Bobby Brown Website
Official website 
Whitney Houston's autograph
Whitney Elizabeth Houston (August 9, 1963 – February 11, 2012) was an American recording artist, actress, producer, and model. In 2009, the
Guinness World Records cited her as the most-awarded female act of all-time.
[1] Houston was one of the world's
best-selling music artists, having sold over 170 million albums, singles and videos worldwide.
[2][3] She released seven studio albums and three movie soundtrack albums, all of which have diamond, multi-platinum, platinum or gold certification. Houston's crossover appeal on the popular music charts, as well as her prominence on
MTV, starting with her video for "
How Will I Know",
[4] influenced several
African American female artists to follow in her footsteps.
[5][6] Houston is the only artist to chart seven consecutive No. 1
Billboard Hot 100 hits.
[7] She is the second artist behind
Elton John and the only female artist to have two number-one
Billboard 200 Album awards (formerly "Top Pop Album") on the
Billboard magazine year-end charts.
[8] Houston's 1985 debut album
Whitney Houston became the best-selling debut album by a female act at the time of its release. The album was named
Rolling Stone's best album of 1986, and was ranked at number 254 on
Rolling Stone's list of the
500 Greatest Albums of All Time.
[9] Her second studio album
Whitney (1987) became the first album by a female artist to debut at number one on the
Billboard 200 albums chart.
[9] Houston's first acting role was as the star of the feature film
The Bodyguard (1992). The film's original soundtrack won the 1994
Grammy Award for Album of the Year. Its lead single "
I Will Always Love You", became the
best-selling single by a female artist in music history. With the album, Houston became the first act (solo or group, male or female) to sell more than a million copies of an album within a single week period under
Nielsen SoundScan system.
[9] The album makes her the top female act in the top 10
list of the best-selling albums of all time, at number four. Houston continued to star in movies and contribute to their soundtracks, including the films
Waiting to Exhale (1995) and
The Preacher's Wife (1996).
The Preacher's Wife soundtrack became the best-selling gospel album in history.
[10] So I am not sure about her using an incorrect vocal technique for vibrato. If is sounds good, use it. However, a good vocal coach can listen to you and help with those technical issues based on your own style. That's about the best I can offer. By the way, I think you are an awesome singer!
Rimshot