first ...if she's dealing with alot of stress in her life (job, school, family and confusion of having a boyfriend, and isn't answer your calls, you need to back off for a bit and give her time to sort things through.
She's explained she's NEW to going out on dates and being in a serious relationship. perhaps things were moving too quickly for her.
Perhaps you could email her a lil letter stating that you Respect her wishes , and you're there for her if she fancys talking with you.... Give her breathing room~ She has been honest with you saying this is too much for her right now~
Girls are not the ones that are complicated...Men just need to know what RESPECT means...and follow through~
tip for you : Communication, Honesty and Trust in any relationship =Respect....without one of those, you have Nothing~ Give her the time she needs and she will reach out to you~
Always communicate be honest and trust your partner.Respect them and their decisions.