How would you translate big in this case

I think it must be "She is big into concept art and graphic design." That is a slangy way of saying "She is very much interested in or involved with concept art and graphic design."

Thanks , I'v figured out

exodus74Thanks , I'v figured out

Good for you. Do I get to know whether my guess was right?

in the meaning of idea probably you was right
Girl told about herself:-" I big into concept art and graphic design."
I just rephrased she bigs into concept art and graphic design
I added the letter s

exodus74in the meaning of idea probably you was rightGirl told about herself:-" I big into concept art and graphic design."I just rephrased she bigs into concept art and graphic designI added the letter s

Her original line was not grammatical. Either you didn't hear the "m" sound (I'm big into...") or she was not speaking grammatically.

She didn't speak, she wrote it not grammatically correct.

All of us make typing mistakes.
Be assured "big" is not a verb.

ok

did she mean 'digs'? then it may have (some) sense.

Not with the "into" after it.