If she's not taking good naps, that could definitely cause this fussiness. It's warm now! Take her outside 1-2x a day and really run her around! Get her good and tired out, and make sure she's taking at least one long nap a day. Then get her to bed early, so she gets 11-12 hours of good sleep at night. That might be just what she needs!
If she's napping and sleeping well though, isn't sick a lot (ear infections or reflux), and isn't teething too badly (if motrin doesn't help), then I would schedule an appointment with your pediatrician soon. I don't really think that toddlers cry constantly because of "too much attention." My 15 month old already has pretty bad tantrums, and he whines and cries quite a bit! But it's not all the time, and it doesn't make me wonder if something's wrong- you know? I can tell it's just the normal toddler frustration.
If you're wondering, then your gut is telling you something. Talk to your doc. If it's a sensory issue, then a specialist can help! The last thing we want is for our little ones to have extra stress in their lives. Definitely ask for help!