Not every bride wants to go to see a stripper at her bachelorette party. In fact I've only been to one bachelorette party where there was one.
While the bachelorette party details can be a surprise, they don't have to be. And in fact I suggest talking to the bride about what she does and doesn't want for her bachelorette party.
Maybe she wants to go to a spa and dinner. Maybe she wants to have an old-fashioned slumber party. Or maybe she wants to get wasted and see some male strippers. You won't know until you ask or she tells you what she does and doesn't want.
And as for the guest list, you should double check with her on who to invite. She may prefer to keep it to just the bridesmaids or she may want a larger group. She may want her mom there or she may not.
The bachelorette party, like the bridal shower, are hosted by the bridesmaids and thrown in honor of the bride but that doesn't mean the bride shouldn't have any input. The worst thing the bridesmaids can do is plan a party that the bride would be uncomfortable at.