She was the runner-up at the 2002 USA Indoor Track and Field Championships behind Mary Sauer and improved her outdoor best to 4.50 m. However, she only managed tenth place at the USA Outdoor Track and Field Championships that year. She placed sixth at the 2003 USA Indoors but rebounded with a second-place finish at the outdoor nationals.[3] This gained her a place on the team for the 2003 World Championships in Athletics and she came eighth in the qualifying round of the vault.[5] The 2004 season proved to be her breakthrough year as she was runner-up to Stacy Dragila at the USA Indoor Championships and then placed fourth at the 2004 IAAF World Indoor Championships, vaulting a personal best mark of 4.60 m.[6] She achieved the same mark outdoors to take second at the Prefontaine Classic and was runner-up to Dragila at the 2004 Olympic Trials, securing her first Olympic berth.[3] She cleared 4.30 m in the qualifying rounds of the 2004 Athens Olympics, but this was not enough to make the final.[7]
Schwartz did not compete indoors in 2005 but managed to finish in the top three at the USA Outdoors. One of three Americans in the women's pole vault at the 2005 World Championships in Athletics (along with Dragila and Tracy O'Hara), she finished second in the qualifying but could not repeat her form in the final round, ending up in eleventh place.[5][8]
She became the Voluntary Assistant Coach for the Columbia University track and field team in 2008.[9] She was the runner-up at both the national outdoor and indoor championships in 2006 and improved her best by a centimeter to 4.61 m in Jonesboro, Arkansas. She competed at the 2006 IAAF World Indoor Championships, but did not make it into the final on this occasion. She also made appearances on the 2006 IAAF Golden League circuit[3]
She competed at the 2009 Maccabiah Games in Israel and won the pole vault gold medal for the United States. Officials approached her about a possible move to compete for Israel and she agreed, seeing it as a better chance to participate at the 2012 London Olympics given the strong competition for a place in the United States.[13]
She gained Israeli citizenship and switched nationality in preparation for the 2010 season. She set an Israeli record mark of 4.60 m indoors in Jonesboro in May 2010 and then set an outdoor record of 4.60 m to win at the Adidas Grand Prix Diamond League meet. She won her first national title at the Israeli Athletics Championships in June. Other performances that year included at win at the Vardinoyiannia and runner-up at the London Grand Prix Diamond League.[5]
In the 2011 season she cleared 4.50 m early in the season and won at the 2011 European Team Championships 3rd League, but she did not reach higher as the year progressed, finishing second at the national championships and being eliminated in qualifying at the 2011 World Championships in Athletics. She opened 2012 with a win at the U.S. Open Track and Field in January in a season's best of 4.52 m. Again her early performances remained the best of the year, as she finished eleventh at both the 2012 IAAF World Indoor Championships and 2012 European Athletics Championships. She did, however, manage to win her second national title and make her Olympic debut for Israel at the 2012 London Games, competing in qualifying only. She retired from the sport after the Olympics.[5]