An old, obsolete meaning for "hump"?

What does in a hump mean, in this context?

From a 2008 article authored by a cancer patient:

"and when I found out the cancer had returned and that I needed chemo, I just fell in a hump on the floor" Santa Fe New Mexican

Ngram shows plentiful use of in a heap, zero use of in a hump as used in this question. I suspect hump here is a variant of heap as in your citation and mine. The cancer stricken patient may have been in the hump BrE: a fit of depression; an emotional slump. as she fell in a hump.

As in:

I fell in a hump, tired, exhausted and depressed.

And from hump etymology: wikipedia

Probably borrowed from Middle Low German hump (“heap, hill, stump”), or from Old Saxon *hump (“hill, heap, thick piece”)