We are not at crisis point, yet, but it is coming. DMiL is managed very sensibly by a team of two plus SiL, for about 2-3 hours daily. After a couple of dodgy years, she at last has the help needed and is being reminded to eat the food prepared for her (most of the time) and take her meds. Thanks to them, she isn't deteriorating. But she claims to eat, and sleep and shower and wear clean clothes; the reality is that she only does so when nagged a bit. She says she goes out and plays bridge several afternoons each week, but doesn't. She remembers what she used to do regularly, but it doesn't happen now.
Except that she is livid with her son for saying she's not competent to drive (and phones me to say so, frequently!) She hasn't been capable of driving any distance for four years, but still insists she would be fine to tackle the six hours between our homes (last time, she got lost for three hours and had to be rescued from the middle of nowhere).
Eventually, she will get a nasty virus/bug and succumb quickly, or there will be a move to full nursing care. A few years ago, she asked me to accompany her on the Swiss Air route, but she is no longer competent to make the decision. DH despairs, and it's desperately sad for everyone. Nevertheless, she has her wits sufficiently to be able to answer the social worker's questions fluently, and to blag the ones she gets wrong.