First of all I am a young professtional woman and believe me it can be hard to juggle a career and a relationship and this stage in life. To be honest with you I think you should stop thinking about yourself and how lonely you are without her and put all that time and energy into the time that you do get to share together.
Why don't you spice things up a bit, buy her some longerie, run a bath, just do little things to set the mood. If she is relaxed and comfortable this will make your relationship alot better.
To my understanding she feels guilty about all the time she doesn't get to spend with you and you are probably making her feel this way. If you really care about her you should support her because she is doing what she has to do or loves to do.
Did you ever think about getting involved in something you feel passionate about. This would give the two of you more things to talk about!
Sorry, but I figured if you posted this message you wanted to have an honest reply.
theone&only