Bowlingbun is absolutely spot on.
Like Bowlingbun I too have a Dyspraxic son, among many other problems he has Dyspraxia is one of the things he's really struggled with.
When you say you have to repeat things to your daughter, this is one of the things with Dyspraxia or other conditions.
Can you imagine an old fashioned telephone exchange? where people used to have to plug in the wires to send the messages to the right line? Imagine a person in charge of the wires who gets confused and plugs the wires into the wrong holes. This is what it is like for someone with Dyspraxia. Sometimes they hear what you say, they can repeat what you say but somewhere in transmission it gets lost.
I used to work in Education but spent a lot of time trying to "teach" teachers about Dyspraxia and other specific learning conditions or problems. Teachers would get annoyed with the child who was always falling off their chair etc. I would try and highlight to the teacher why the child was falling off the chair etc and try and give the teachers strategies to help the child.
As you say your child is about 2 years 6 months, you may find that professionals are reluctant to actually make a diagnosis as yet which can be really frustrating for you. Licking is an excellent idea from Bowlingbun. It really helps. You may also find mimicking instruments helpful for your child. They listen to the sound of a drum or a tambourine for instance and try to copy the sounds. When you are encouraging her to say words, imitate a drum for instance and tap saying, d, d, d, d, d, d, drum.
A salt/sand tray can help but it depends whether your child has any sensory processing issues. Some children really enjoy the texture on their hands and others will avoid it like the plague. If your child will tolerate the sand/salt draw pictures and make sounds. Then transfer these pictures and sounds by tracing the sounds and pictures onto the palm of your child's hand or onto their back.
A soft squeezy ball in the palm or their hand may help them too. As a comforter, to roll and to squeeze. This may all sound rather silly to you, but these things do work when you are talking to your child and she has to concentrate for a period of time if she's holding the ball, it helps. As she gets older, you could sit her on the bed or a trampoline and gently push the bed up and down. Make a little game of it where she has to balance as you push the bed and rock it gently and increase the pressure. Talk or sing and make a game of it. This will help strengthen her core stability whilst encouraging one to one concentration time that is fun but helpful at the same time. There are lots of games and things you can do at home that will really benefit her. Some children enjoy playing with balloons but you may find others are terrified of them so it's a matter of what your child's feelings are. If she is sent for OT or physio they may do group therapy sessions.
You may find she is referred to orthotics to help with insoles or special shoes to help aid balance.
You have to push for all the help you can get. It sounds like you have your Mum on your side and that always helps.