If you buy fabric at hobby lobby and it has white strings tied around it does that mean it is a full bolt?

My sister and I made PJ pants for our family this weekend and the lady pulled 2 cut-pieces off the bolt and then got to white tied strings and said this is a full bolt and looked at the end and said its 15 yards, which was slightly more than we needed so we're like ok perfect we'll take it all. Well we didn't have enough fabric so I'm just wondering if I don't understand how fabric is labeled or if I got screwed.

My assumption is 15 yards on a bolt and 44" wide I should get a piece of fabric 540"x44"?