Off topic.

This is just my own opinion.  Bird nest is good for skin while DOM/ Yomeishu is good for uterus, mostly during confinement to keep warm, chicken essence is good for temporary focus and concentration power.

In my point of view, actually your mum doesn't need all this, not that she doesn't need it, it just that I believe (you know her the best) your mum is a frugal person, she save and rather spend it on her loved ones.  If this time, you really buy healthy tonic for her to drink, I guess she will not drink it too, she will keep it as long as she could for rainy day, some Asian parents are like that.

When an elderly content with their life, they tends to be happier and healthier. 

Correct me if I am wrong.  Just sharing.

Sometimes it is a bit difficult to know what elderly want, money can't always buy them happiness.  Of course depend on which kind of elderly too.