David
Aw, man. She definitely should've eaten before coming to the shop; every time she passed a snack without putting it in her trolley, she could feel herself dying inside a little more, stomach lamenting its own emptiness. Marnie sighed to herself as she passed up on yet another delicious food- she was here for very specific stuff, and had it deeply ingrained in her not to waste money- and kept going. Her eyes scanned the aisles as she went, searching for what she needed- Morpeko's favourite treats, as a reward for being good so far. But instead of treats, she ended up finding something entirely different- a person, with that distinctive hat that marked her as one of Marnie's best friends and/or favourite people to harass.

"Oi, Glo!"
Natalie
And here Gloria was, groaning while inspecting the shelves. Her trolley was almost full- though almost everything in there were essential things, nothing resembling snacks. Her body was on autopilot, while her mind was busy daydreaming. "If I were the champion, I wouldn't have to eat damn beans and potatoes every day", she thought. She murmured to herself as she walked by the shelves, although she was interrupted by a familiar voice.

"Cabbages... Tomatoes... Ello, Marnie. Spinach? Ew. Onions...? Maybe- MARNIE?!"

Her mind was so preoccupied that she didn't notice her standing next to her. If she didn't jump in shock a few seconds later, any outsider would think that she straight up ignored her.
David
Ha! Got her. Though it was hard to notice if you didn't already know her, Marnie's lip twitched almost imperceptibly in amusement at Gloria's reaction. The casual greeting followed by the absolute shock was something that got her *Every time*. 

Luckily, she soon managed to compose herself once more, face returning to its eternal straight line of seeming indifference. "Yep, it's me. Maybe Marnie." A pause, so hopefully Gloria would get that she was taking the piss out of her and her jumpscare, and then she spoke again. "Ey up, Glo, it's been a bit. You still chugging on?"
Natalie
Not this thing again! Her time in the island had been mostly peaceful so far, which actually made seeing her much more shocking. She knew that Marnie was here, but she didn't expect their first encounter to be like this. This unexpected encounter *Did* Make her feel a bit warm and fuzzy inside, though. One of her best buddies -and rivals- was right in front of her.

Gloria immediately understood that this sudden appearence wasn't a mistake, Marnie was purposefully trying to scare her! She wasn't surprised at all though, this wasn't the first time she did something like this -and probably not the last. 
"I'm... Survivin. There isn't much else."
Her face suddenly changed, her slightly shocked smile disappeared, getting replaced with a strange mix of tiredness and anger.
"An' ye know what? I'm almost boutta' die o'boredom in this goddamned island."