Mixed feedback from speech therapists.

Hello my 2 year old daughter doesn't talk at all. She makes some noises, but no words. She doesn't seem to understand anything when we talk to her. She doesn't gesture. Caring for her is similar to caring for an infant, she cries and we do our best to guess. She is currently under assessment with the pediatrician who has suggested autism or learning difficulties. 
She has had two hearing tests one just after an ear infection  which wasn't the best and one 6 months later which was fine. 
She saw a speech therapist and she suggested we try and work on gestures, my daughter made very little improvement, she does now gesture to be picked up but not to communicate a need. She said makaton or any signing wouldn't be much use as my daughter doesn't make much eye contact. 
We then moved house and area which gave us a new speech therapist. She suggested we use makaton and had the opposite to say about it. I expected differences in approach and obviously we would try anything we can to help her communicate with us. 
She shows no sign of signing herself and doesn't seem to understand my signs backed up with words. If I sign ball while we play with a ball she may give me the ball or another toy, she sees this sign as give me the toy you are holding, I've now paid to go on a makaton course incase it's me signing wrong. I'm trying my hardest and feel I'm getting nowhere. She is generally a happy girl but I long for the day she says mummy, I'm actually more hung up on that than I realise as it makes me tearful just thinking about it. Any advice would be wonderful. Any parents started makaton at this age? Was it helpful? How long did it take for your child to understand your signs or to sign back. Many many thanks.