I have a friend whose older brother's child is about 15 months old now. She's still nervous around strangers, but it took her about a year to warm up to the rest of the family (my friend, her sister and their parents). She's ok around them now, but she's still most comfortable when her parents are there.
There's nothing wrong with babies sleeping in the same room as their parents. Some parents prefer it, so they can more quickly attend to their baby when he/she cries in the middle of the night, and/or they feel closer to their baby. And of course, some parents prefer to co-sleep with their baby, forgoing a crib and seperate room altogether.
It could just be her personality, some kids are more clingy than others. When I janitored in malls, more than once I saw babies who'd freak when their mother would go into a stall to use the washroom and leave the baby in the stroller -right outside the door-. Babies don't always understand object permanence (that their parent is still there, even if they're behind the bathroom door) and they can't read their parent's mind to know when he/she is coming back.
I do know that in babies, I think from between 6 - 8 months, go through a period of seperation anxiety, and it is normal. If she's 13 months, that doesn't sound too abnormal to me, but if her parents are worried then they could always ask their doctor.
Here are some links about seperation anxiety:
http://www.drgreene.com/21_1183.htmlhttp://kidshealth.org/parent/emotions/feelings/separation_anxiety.htmlhttp://www.babywhispererforums.com/index.php?topic=62612.0The only experience I can relate to with seperation anxiety is about a girl I grew up with. In kindergarten, I can remember her SCREAMING bloody murder as her mom tried to drop her off for the day. She was quite literally hanging off her mother. I don't remember what happened, but I do remember her being so upset. When we were in elementary school together, which was located right down the street from our neighbourhood, her mother walked her to class every day until the end of grade 6.
sweatdrop That's the point where obviously something's up, anxiety is too high and counselling might be in order. But 13 months doesn't strike me as being too out of the ordinary.