It could be. Despite what some others have posted, night terrors can happen at any age, even to adults. My daughter who is now 9 has had issues with them since she was about 18 months. The first time it happened I was scared to death b/c she was so young, I almost called the paramedics... I thought maybe she was having a seizure!
One of the moms who posted is correct about how if she can remember the episode then it probably was a nightmare, and not a night terror. And yes, it is so hard on parents. My daughter cries out for me, is absolutely terrified, even with me right there... and touching her to try to soothe her actually makes it worse!!! My daughter can't remember them either and also will get up and use the bathroom and can respond to us in a limited capacity. It usually subsides after about 20 minutes, when she falls back into a normal sleep cycle. I have learned to sit paitently by her side and every so often tell her I am there for her, that it will be OK, but this is more for me I think. I hate them!!!
We found that being overtired and falling asleep very quickly can often be a trigger later in the night, which is pretty much out of our control sometimes, and a growth spurt might factor in too. They occur very rarely these days, but we did actually have one over the weekend.
Hang in there, just know that she will be alright... it's just such a terrible feeling not to be able to comfort your child when they are scared.