I don’t know much about what her night routines etc are like but to be fair, aging is often logarithmic rather than gradual - that’s to say, it often occurs in sudden bursts. Also, parenting ages you. The extent varies hugely ofc but the oxidative stress of a pregnancy and then breastfeeding, sleepless nights etc is really considerable. You factor in that she has an inflammatory condition that means her immune system and gut are permanently under some degree of siege and that applies tenfold. Also it’s very common for the effects of trauma on the body (which the poor girl went through a lifetime’s worth of all at once a few years back, let’s not forget) to take a while to “hit”.
She almost never wears makeup now (before she almost always appeared in it) and looks a bit washed out in a way that eg an iron supplement might hypothetically fix, but beyond that it’s a normal amount of aging for a woman her age who’s become a mother imo.