Now I can finally put my Undertale knowledge into use: she was a lot like Alphys good ending run (except Alphys was actually supercompetent in-story unlike the present person I'm talking about). Some problems:

1. Stops communicating when she had problems
2. the general lack of guts to just try out things
3. All or nothing thinking when it came to implementation. I think that coders mostly implement one thing at a time, see if it works/compiles/passes the test and move on to the next thing and learn from the experience and apply it to further cases. This was totally absent. I think she tried to figure it out all in her head and if she felt any uncertainty, she just didn't try to code.
4. Didn't habitually compile/test/see whether software worked and fix problems or annotate them if unfixed.
5. Couldn't read official documentation Java had.

Honestly I'd say it was mostly a series of emotional issues more than anything else. You can't learn coding if you fear compiler/test feedback and trying out things and fall apart when things don't work.