Here's what I would do. I presume you're all meeting at one place so the limo doesn't waste time picking and dropping off multiple guests. So, when you meet up and before you leave, take up the collection for the limo (including tip). Make sure Patty pays her share (for her and her daughter.) Also, make a casual but pointed "check" of all party goers to ensure they have their wallets, cash, etc. for dinner. Point blank, ask her "Do you have your cash or credit card to pay for you and your daughter's dinner?" as if you're checking in. If possible, send a group email to all the partygoers informing them that limo driver fee and tip will be collected before the drive takes off, so please have check or cash ready. This way if she isn't prepared to pay, you know from the start and can either offer to drive her to the bank, or take her aside and ask her what her plan is because you won't have her spoil this night for your friend by making Lola pay for her and her daughter.