On earlier suggestions: Sign language - excellent! My 22-year-old is now a sign language interpreter, you never know what it will turn into! Letting her BE frustrated sometimes - solid advice. Teachable moments on vocabulary come at times like that, "Are you FRUSTRATED or MAD?" My son felt better when he could assign words to feelings (around 2-3). He's been noticeably articulate since then, appropriate wording just connected with him when we supplied it. Sense of humor is helpful even if she doesn't totally understand you, "Those things annoy me sometimes, too! Tell me if you want help." Being available and watching, but not interrupting her process, is also very good practice for when she is a teen. She can see you and knows you're available, but is not required to interact with you while she's focused on the issue at hand. No need to let her frustration become yours, she's growing and learning, all healthy stuff. As a preschool teacher, we also used to constantly research activities to expose the kids to as many medium as possible so that their skills and experiences grew rapidly, like walking in jello (in the bathtub), fingerpainting with pudding (in zip-lock if you want to keep it neat), playing instruments, a petting zoo, stacking nesting boxes, cooking, and especially reading books.