If you happen to discover that your daughter is on the autism spectrum I recommend that you look into RDI(relationship development intervention)
First and foremost, if you have concerns about your daughter’s development, I strongly recommend that you speak with your daughter’s pediatrician. Pediatricians are usually the first contact point for accessing additional assessments (if needed) and services.
One comment: when she screams louder when you “go against her”, does it is usually or even occasionally result in people “backing off” going against her? This does not necessarily mean that she is or is not on the spectrum only that it is possible that some inappropriate patterns of behaving are developing (which can happen with any child). You may want to speak with your pediatrician about this to see is he or she has any recommendations for help with child rearing books or services.
Regarding autism, meantime you may wish to take a look at the websites below. They have information about early identification of children with ASD and general child development. I also included a couple of websites that might help you find information about child rearing (you may have to search links connected to eth sites). I hope these are helpful.
About.com Pediatrics
http://pediatrics.about.com/od/weeklyquestion/a/04_signs_autism.htm
American Academy of Pediatrics
http://www.aap.org/healthtopics/Autism.cfm
First Signs
http://www.firstsigns.org/
Association for Behavior Analysis
http://www.wmich.edu/aba/index.html
Cambridge Center for Behavioral Studies
http://www.behavior.org/