Hello and Welcome to ‘Ask A Doctor’ service. I have reviewed your query and here is my advice.
By what you say she is just having temper tantrums and as you said developmental
pediatrician would be the best. Tantrums may happen when kids are tired, hungry, or uncomfortable; or because they can't get something (for example, an object or a parent) to do what they want. Learning to deal with frustration is a skill that children gain over time.
Tantrums are common during the second year of life, a time when language skills are starting to develop. Because toddlers can't yet say what they want, feel, or need, a frustrating experience may cause a tantrum. As language skills improve, tantrums tend to decrease.
This is what you can do to avoid or prevent tantrums -
1. Give plenty of positive attention
2. Try to give toddlers some control over little things
3. Keep off-limits objects out of sight and out of reach
4. Distract your child
5. Help kids learn new skills and succeed
6. Consider the request carefully, when your child wants something
7. Know your child's limits
Regards.