Bismillah
Jazaki Allah khairan Jennifer for making me ponder more deeply in the hadeeth. Sobhan Allah, as far as I can see, probably Umm Salim realised and thought of the other hadeeth that promises parents who loose children and maintain patience saying inna lilahi wa inna elayhi rajeoun that Allah Commands for the building a house in Jannah for them. This is what mitigated the hard test for her and allowed her to behave in such a manner. wallahu a`lam.
May be you too if u try to ponder more deeply you can come up with more lessons to be learnt and share it with us.