Colicky mare (still I think)-(Please answer ASAP, heading back out soon!)?

My POA mare is really sensitive to sand, and we just got her on Sand Relief. Unfortunately, it didn't kick in in time, and she's been colicky today. It started around 4-5pm, pretty mild. Not wanting to eat grain...I check the grumbling in her stomach-it was there. Soon, she wouldn't eat her hay. The grumbling slowly goes quieter. Then she starts kicking her belly and shaking her head. She never layed down though. I walked her up and down little hills and everything. She would get colicky, then be fine...then get colicky again. Want to eat, then not want to. Finally, she layed down, and tried to roll. I got her up and walked her. Then she layed down and tried to roll again. I let her lay down and rest for a bit, then got her up. This whole time, she's still going back and forth. She didn't want any water at all though. Finally, she seemed to act normal, and I left (of course, keeping a close watch on her out the window. I went back out around 9:30pm, and she was laying down. Her stomach was rumbling loudly though. I'm not sure if it's just because I put new shavings in or not (they're run-ins, so there's usually no shavings at all). I AM worried that she is still colicking though, since she is still acting just a little bit funny (just holding her head down. she is alert though). I have not seen her poop...which is worrying me. She may have done it while I was inside for 2 hours or so, but if she did, it wasn't near the sheds. What are your thoughts? I am home alone right now (because I didn't want to leave her when they had plans to meet friends for glow bowling), but my family is getting home soon. If she needs it, I have Banamine, but I don't know if she needs it. She's not showing many signs of colic. Will it hurt if I give it just in case? Also, I don't know if she isn't pooping because it's too hard or runny (she's had both problems before).