I want to communicate to a person that her situation and conditions are understandable and I get it.
You're being understood.
the most accurate one? Is "understood" the best word in this context?
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Google suggests many, as well as a few of my own:
Although these are all options, yours fits the bill just fine, if not a little formal. For a word in a casual conversation or chat1 you might like to try:
"Yeah, I get you"
"It's all clear"
In summary, you've used the right word, but there are some good alternatives out there if you wish to use them!
To express sympathy, you could (and should) use different terms to those that describe a knowledgeable understanding. If the person is going through a bad time:
Or, if the person is judging their actions (or themselves) in response to their situation and circumstances:
Or, if you've been through a similar experience: