(This is not the first time she has made such a mistake)
Could this be termed "Near success syndrome in trading?".
Are you or Do you know someone with a similar episode?
She doesnt learn and as mentioned this isnt the first time she had make the same mistake.If she is really serious on making profits then she should really be
contented on what she do earn rather than on being greedy and do ask for more.As she had already the experience then she must be aware about the probabilities
or she do tend to make out some experiment until she do able to hit it out on making some big gains? Well, this isnt bad but you should prepare nor accept
on what are the probabilities of things to happen.
Traders that are not profitable most of the time are like that not because of lack of opportunities but because they are unable to curb their greed, as the example given by the OP her friend had tremendous profits already, asking for more than that was just greed and instead of selling when she had the opportunity she kept waiting for profits that never materialized.
This is why people need to set objectives when they make a trade and once those objectives are reached they need to sell, it is true that sometimes you are going to sell sooner and you may miss the top but it is way more likely that you will sell before an important crash and you are able to retain most of the profits you obtained during the time you kept your trade open.