Help my daughter Jessica to get a diagnosis

Hi my name is Steph I’m 25 years old I am a mum of 3 

My oldest daughter Jessica is 7 years old she will be 8 in June she’s had an ongoing bowel condition since birth in which she has several accidents a day she can’t function properly her nerves aren’t working in her bowels which she isn’t getting the signals in her brain that she needs the toilet she’s been admitted into hospital several times since birth in regards to her bowels because of severe swelling and the amount of pain she is in she was In hospital all last week with it also. I have been fighting for 7-8 years now for them to take a biopsy and to test her for any medical problems in which is or could be causing this problem for her wether that be chrons disease or Hirschsprung’s disease and they just keep pushing it back over and over again and all the medications she’s been given since birth haven’t worked for her as her problem keeps recurring! How ever I’m seeking anyone that could please help us with the costs as to go private I’ve been quoted of spire hospital in Manchester that it will cost £1650 for her to go private and have the biopsy and medical checks  with them which can be done as soon aspossible rather than waiting years down the line for her to just get worse in the long run , I just want my little girl to have the diagnosis and the answers she deserves as she’s very emotional and traumatised with everything that’s happened so far she just wants a good ending to all of this and I think this is the best way forwardfor her , so please please please can you kindly help my daughter get what she needs and deserves , thank you very much kind regards fromme her mother