http://uk.businessinsider.com/bitcoin-price-technical-analysis-goldman-sachs-top-2017-8
She was right in the first part of her prediction in that bitcoin blasted up to $4827+.
Whether she is right about the correction following that is anyone's guess.
I dont think that it will go to that level of downward we can see some correction and going till 4200+ level but below that it will start the panic selling and then we cannot see how much low we can see because now 5k is the sentimental price which once crossed it will move more 400 to 500 usd upward.
Nothing will surprise me about crypto anymore. My feeling is that the push towards $5k happened just too fast, and people started getting cold feet and cashing in.
Also, the next difficulty retarget for bitcoin is in about 5 days time according to the following site:
http://fork.lol/pow/retarget
I expect the difficulty to increase, as btc has been doing blocks every 7 mins. If a difficulty increase is combined with a drop in price, we might see miners switch to the other chain causing backlogs again.