S.H.
Separation-Anxiety... or teething, or hunger.
Also at this age, just having turned 1.. they undergo a TON of developmental changes and hitting major milestones and cognitive and physical/motor skill changes. This tweaks their sleep, is normal.. and many times it can be more than just 1 thing happening at a time.
Or, do you or Hubby snore?
Sometimes we parents are the one's waking them.
Or, if she sleeps with you, maybe the tossing and turning and movements of you/Hubby can wake the baby too.
She is undergoing many changes now... just soothe/comfort her. This is normal... I really don't believe in hard-core "methods" or crying it out.
And many times, there is no rhyme or reason for a baby waking/crying, that we can figure out. Sometimes it just is.
And yes, listen to her cries... sometimes, they make noise/cry in their sleep... but it is intermittent and they are actually still "sleeping" and can fall asleep on their own again. Sometimes, in these instances, our interrupting them will just completely wake them. My son did that sometimes... but I knew by his sounds/cry/pitch... whether he needed me to intervene or not. Sometimes he'd even get irked if I interrupted him.
Both my kids, at that age, were waking too. I just went with the flow.
And for my son, teething bothered him more than my daughter and he had a lot more pain.
Also make sure she naps, regularly. Over-tiredness can actually make a baby/child not be able to sleep well, and they wake more.
Does she have a lovey?
Does she have a crib toy? The fisher price Ocean Wonders is real great. Both my kids loved it.
All the best,
Susan