Take her to a R.V. place that know's what their doing, they can test it. My feeling, is the fridge is shot , anytime you "smell that smell" you replace it, don't have it rebuilt, REPLACE IT! Believe me, we've been there: a re-build will not last long. (Ours lasted a year). Being full-time, we get 10 years out of a fresh Dometic. We replaced ours last year: 2K parts /labor, big deal (after the shock wore off and we had a fridge again).
"A settled wisdom, plus the itch to be elsewhere"