Of course not! We've taken a total year's break from formal math with my eldest twice over the past 5 years. Whenever we've come back to it, she's burst forward with at least a year's worth of progress in almost no time. Enough to make me wonder why we do the formal stuff at all.
Card games and dice games are excellent intermediate steps between concrete and abstract math. They're symbolic to an extent, but in a more concrete way than numerical digits, and they're concrete to an extent, but more abstract than manipulatives like counters. Money is also a terrific semi-abstract manipulative. It gets bonus points because it's a base-ten system if you remove the nickels, quarters and $5 and $20 bills, and because it's real-life stuff! Does your dd have an allowance or a money-making venture like a paper route or egg-selling business? That would help really get her interested in learning how to use and calculate with money. My three older kids are allowed to spend $5 at the grocery store each week on food. They generally buy chips or gum (yeah, it's barely food, I guess, but we count it) but sometimes they choose something healthier. This not only stops them whining to get me to buy them junk food, but it engages them in mental math, calculating how much they can spend.
The "Box Cars and One-Eyed Jacks" series of spiral books is filled with tons of ideas for math games. Most of them are designed to help kids gradually internalize math facts in abstract ways, but with the card-faces and/or dice dots there to help as necessary. You might combine this with some other games like Monopoly, Countdown, Snakes & Ladders (play a version where you can add, subtract or multiply two dice to get the most advantageous move), chess, checkers, Battleship or other grid-style games, for a daily session of games. You'll quickly discover a few that seem to "work" for your dd, both in terms of holding her interest and inspiring her, and in terms of increasing her comfort with simple mathematical computation. Another excellent game for the car, or anytime, is "I'm thinking of a number". You think of a number and give a clue or two. For example, "I'm thinking of a number with 2 digits that add up to 9." Your dd's job is to ask yes/no questions to correctly identify the number. She might as "is it more than 50? is it more than 70? is it 54? is it 63?" to get at the answer. My kids love this one, and they learn a ton playing it.
Hope that helps!
Miranda