I can understand you must be feeling very upset your girl is not responding to you .I tend to agree too that certainly the 3 things you have mentioned may well have a part to play in her attitude, for example if you have called her to you, then given her a hated bath, or cut her nails etc, (you didnt cut the quick?!) she may well want to avoid you, esp. if she tends towards sensitivity.
If possible it is best to "fetch" the dog to do these things, and also make them as rewarding as possible. OK it can be hard to do this

, but for example if you tend towards tellling her off if she fidgets whilst being groomed, consider rewarding her good behaviour instead with a toy, treat or play break so she at least doesn't have a totally "horrid" time ;)
Regarding no. 3, discipline, it is not fair for your family to let the dog jump over them when you don't - not fair on the dog, who will then see you as being "mean", nor on you who has to attempt to enforce the training. It really is important that everyone in the family is consistent and fair to the dog, or the dog will not be happy and not be certain as to what is expected, and this could cause confusion.
Best of luck
Lindsay