Cat need medical attention

Help pipe, Norway

My cat Piper hasn´t been feeling well for a time. Took her to the vet a couple of days ago for a check. They haven´t really found out what the problem with her is during this first check, and they say they need to perform some more test. The problem is that they are quite expensive (would cost around 1000$) and I haven´t got those money right now. Somebody who feel they can contribute a amount to these cost? Otherwise I feel that if I can´t help her, I must soon put her down, beause it isn´t right to let her suffer.