The Still Into You hitmakers were forced to scrap two gigs in Texas this week (beg04Aug14) after frontwoman Williams fell ill with exhaustion and a chest infection.
However, by Thursday she was well enough to resume the shows on the Momentour, a double-header with Fall Out Boy.
Prior to the concert, she told fans on Twitter.com that she had completed some promotional duties that day and couldn't wait to get back on stage, writing, "Ok - 1st meet & greet in 4 days, completed. I'm still alive. Albuquerque will feel my wrath tonight!"
After the gig, Williams gave fans another update on her health, tweeting, "Made it thru (through) the show tonight!! Only coughed up some green no big (deal)... thx (thanks) Albuquerque!"