One suspects that there was so much going on in her mind that she had difficulty letting it out and putting the words in the right order. As an adult she was known for her pressured speech when excited and this may have been part of her illness.
I guess the modern term would be having a mind dump. When you have so much to release it can be hard to control the flow.
But this rich mind full of genius and creativity gave us so much for which we should be very thankful.