Three year old waking at night...

Je

How many times per week is "normal" for a three year old to wake and need attention at night? Our 3 year old (turns 4 in March) calls for attention until we come. We can't let her "cry out it" because she gets her baby brother in the next room going... I'm curious how often is normal for a child this age to need parents at night as well as tips to encourage her to settle herself back down.