Back in March my husband and I (hehe it seems so weird saying that, because we were just married on 4-2

adopted a cat from the local shelter. Petco helped us with picking out a food, and we went with Nutro Max Gourmet Classics.Every once in awhile she throws it up! I don't know what's causing this, and I also don't know a darn thing about cats. I just hate seeing her get sick every once in awhile!She just throws up like pieces of it.Is this kinda normal?Should we switch her cat food? I'm so afraid to with everything being pulled from the market. If you t hink we should switch it, what should we switch it to??At the shelter she was eating Friskies, and the Petco employee discouraged that and said it wasn't good for her.Okay! I feel better! LOL I guess I'm just a worrying mother. Thanks!!!